Biology: Classification System
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Questions and Answers

Why is the binomial nomenclature system important in biology?

  • It is based on evolutionary relationships, showing which species are most closely related to each other
  • It ensures every organism has a name that is short and easy for the layman to remember.
  • It provides a universal naming system that avoids confusion caused by regional or common names. (correct)
  • It allows for easy translation of species names between different languages.

Which of the following represents the correct way to write the scientific name of an organism, following the rules of binomial nomenclature?

  • Canis Familiaris
  • *canis familiaris*
  • Canis familiaris (correct)
  • _canis familiaris_

If two organisms belong to the same genus but have different species names, what does this indicate about their relationship?

  • They are likely closely related but have distinct characteristics. (correct)
  • They share the exact same set of physical traits and behaviors.
  • They are the same species but have different common names.
  • They are not related at all.

A newly discovered species of flowering plant is found to have the genus name Rosa. Which of the following species names would be a valid option according to binomial nomenclature?

<p>Rosa alba (D)</p> Signup and view all the answers

Considering the binomial nomenclature system, which of the following represents a classification of the virus that causes COVID-19?

<p>Betacoronavirus 1 (A)</p> Signup and view all the answers

Which of the following best explains the primary reason for classifying living organisms?

<p>To organize organisms based on shared features and evolutionary relationships for easier identification and study. (C)</p> Signup and view all the answers

In the binomial nomenclature system, what does the first part of a scientific name represent?

<p>The genus. (B)</p> Signup and view all the answers

Which of the following is the most specific level of classification used to group organisms?

<p>Species (D)</p> Signup and view all the answers

Which kingdom includes Paramecium and Volvox?

<p>Protista (A)</p> Signup and view all the answers

If two organisms belong to the same family, which of the following must also be true?

<p>They belong to the same order. (A)</p> Signup and view all the answers

Which of the following scientists is credited with establishing the five kingdoms of life?

<p>Robert Whittaker (B)</p> Signup and view all the answers

An organism is classified under the genus Quercus and can interbreed with other members of its species, alba. What is its scientific name?

<p>Quercus alba (C)</p> Signup and view all the answers

Which of the following lists the taxonomic ranks in the correct order from broadest to most specific?

<p>Kingdom, Phylum, Class, Order, Family, Genus, Species (C)</p> Signup and view all the answers

Which of the following is NOT a rule of binomial nomenclature?

<p>Both the genus and species name should be capitalized. (A)</p> Signup and view all the answers

The species name is always written with a capital letter.

<p>False (B)</p> Signup and view all the answers

In the binomial nomenclature system, what are the two parts that make up a scientific name?

<p>genus and species</p> Signup and view all the answers

In binomial nomenclature, the first name refers to the _______, while the second name refers to the _______.

<p>genus/species</p> Signup and view all the answers

Match each organism with its correct genus and species according to binomial nomenclature:

<p>Human = Homo sapien Cat = Felis catus Apple = Pyrus maleus Mango = Mangifera indica</p> Signup and view all the answers

Which of the following challenges would scientists face if the binomial nomenclature, as introduced by Carl Linnaeus, was not universally adopted?

<p>Confusion and ambiguity in the identification and study of organisms due to a lack of standardized naming conventions. (B)</p> Signup and view all the answers

The classification system in biology is designed to be static, with categories that never change to ensure consistency over time.

<p>False (B)</p> Signup and view all the answers

Describe how the concept of a 'species' is fundamental to the biological classification system and why the ability to interbreed is crucial to this definition.

<p>A species is a basic unit in the classification system, defined by the ability of its members to interbreed and produce fertile offspring, ensuring genetic continuity and distinctiveness.</p> Signup and view all the answers

In the classification system, organisms are grouped into increasingly specific categories, starting with the broadest category, __________, and narrowing down to the most specific, __________.

<p>kingdom, species</p> Signup and view all the answers

Match the following taxonomic ranks with their descriptions:

<p>Kingdom = The broadest category, grouping organisms with general similarities Class = Organisms grouped based on more specific similarities within a phylum Genus = A group of closely related species Species = The most specific category, consisting of organisms that can interbreed</p> Signup and view all the answers

How did Robert Whittaker's classification system improve upon Carl Linnaeus's original system?

<p>By adding three more kingdoms—Protista, Monera, and Fungi—to recognize the diversity of microbial life. (C)</p> Signup and view all the answers

Which of the following criteria would be most critical when reclassifying an organism due to new genetic evidence?

<p>The organism's genetic similarity to other groups and its evolutionary history. (C)</p> Signup and view all the answers

The primary goal of biological classification is solely to name and identify species for easier referencing.

<p>False (B)</p> Signup and view all the answers

Which of the following scenarios regarding the proper application of binomial nomenclature is most accurate according to established taxonomic conventions?

<p>Utilizing 'Canis Familiaris' to denote the domestic dog in a formal publication, italicizing both genus and species. (C)</p> Signup and view all the answers

In the context of binomial nomenclature, the species name should always start with a capital letter, irrespective of its etymological origins or intended usage.

<p>False (B)</p> Signup and view all the answers

Explain the evolutionary implications when members of distinct genera are observed to exhibit convergent characteristics, and also use proper nomenclature to exemplify such phenomena with extant species listed.

<p>Convergent evolution in distinct genera suggests similar selective pressures leading to analogous traits. For example, Thylacinus cynocephalus (Tasmanian wolf, extinct) and Canis lupus (gray wolf) exhibit similar morphologies due to convergent evolution, despite belonging to different genera.</p> Signup and view all the answers

Derived from Greek roots, the term 'taxonomy' signifies the 'arrangement' and 'law,' respectively represented by the terms ______ and ______.

<p>taxis, nomos</p> Signup and view all the answers

Match the following organisms with their corresponding genus:

<p>Human = Homo Mango = Mangifera Cat = Felis Dog = Canis</p> Signup and view all the answers

Given the hierarchical nature of biological classification and the principles of binomial nomenclature, what is the most accurate assertion regarding the relationship between Delphinus delphis and the family Delphinidae?

<p><em>Delphinus delphis</em> is a species within the genus Delphinus, which is part of the family Delphinidae. (D)</p> Signup and view all the answers

The binomial nomenclature system, as conceived by Linnaeus, is exclusively confined to the classification of extant species, explicitly excluding extinct organisms from its purview.

<p>False (B)</p> Signup and view all the answers

Contrast the implications of horizontal gene transfer on phylogenetic inference when constructing taxonomic classifications relative to strictly vertical modes of inheritance. How might this challenge traditional Linnaean classifications?

<p>Horizontal gene transfer (HGT) obscures phylogenetic relationships by introducing genetic material laterally, violating the tree-like assumptions of vertical inheritance upon which Linnaean classifications are based. This can lead to polyphyletic groupings and challenges the accurate reconstruction of evolutionary history based solely on morphological or limited genetic data.</p> Signup and view all the answers

When publishing a novel bacterial species, adherence to the Bacteriological Code mandates deposit of the ______ strain in at least two recognized culture collections to ensure reproducibility and access for future research.

<p>type</p> Signup and view all the answers

Match each virus with its respective genus, according to current viral taxonomy:

<p>SARS-CoV-2 = Betacoronavirus HCoV-229E = Alphacoronavirus Murine coronavirus = Betacoronavirus Transmissible gastroenteritis virus = Alphacoronavirus</p> Signup and view all the answers

Considering the modern consensus on phylogenetic classification, which of the following exemplifies the most accurate and comprehensive delineation of taxonomic ranks, taking into account both morphological and molecular data?

<p>Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species (A)</p> Signup and view all the answers

The exclusive criterion for defining a 'species' in all biological contexts is solely based on the capacity of organisms to interbreed and produce fertile offspring, irrespective of genetic compatibility or ecological niche divergence.

<p>False (B)</p> Signup and view all the answers

Elaborate on the limitations of exclusive reliance on morphological similarities in modern taxonomic classification, and propose two alternative methodologies which may provide a more complete and phylogenetically accurate arrangement of organisms.

<p>Morphological similarities can be misleading due to convergent evolution or phenotypic plasticity. Alternative methodologies include molecular phylogenetics (using DNA or RNA sequences) and cladistics (analyzing shared derived characters).</p> Signup and view all the answers

The endosymbiotic theory posits that eukaryotic organelles such as mitochondria and chloroplasts originated as symbiotic ______ organisms, which, over evolutionary time, became integrated into the host cell.

<p>prokaryotic</p> Signup and view all the answers

In scenarios where horizontal gene transfer occurs frequently, particularly among prokaryotes, which phylogenetic method would be most effective in resolving evolutionary relationships while mitigating the confounding effects of non-vertical inheritance?

<p>Employing a network-based approach that allows for the visualization of reticulate evolutionary relationships. (C)</p> Signup and view all the answers

Which of the following scenarios would present the greatest challenge to the accurate application of the biological species concept?

<p>A clade of organisms that exclusively reproduce asexually via mitosis. (D)</p> Signup and view all the answers

Critically evaluate the utility of the binomial nomenclature system in the context of cryptic species complexes, and propose an alternative taxonomic naming convention that addresses the challenges posed by these complexes.

<p>Binomial nomenclature can be ambiguous in cryptic species complexes. DNA barcoding or taxonomic revisions using phylogenomic data coupled with sequential numbering or standardized abbreviations could provide better resolution.</p> Signup and view all the answers

The exclusive use of Linnaean taxonomic ranks (Kingdom, Phylum, Class, etc.) accurately reflects the branching patterns and evolutionary distances revealed by modern phylogenetic analyses across all branches of the tree of life.

<p>False (B)</p> Signup and view all the answers

In cladistics, a ______ group includes a common ancestor and all of its descendants, reflecting a complete branch on the phylogenetic tree.

<p>monophyletic</p> Signup and view all the answers

Match the following taxonomic concepts with their corresponding definitions:

<p>Paraphyletic Group = A group containing a common ancestor, but not all of its descendants. Polyphyletic Group = A group whose members are derived from multiple ancestral sources, lacking a single common ancestor. Sister Taxa = Two lineages that diverged from the same branch point; the closest relatives of each other. Homoplasy = Similarity in traits due to convergent evolution or evolutionary reversals, rather than shared ancestry.</p> Signup and view all the answers

Given the complexities of viral taxonomy and the propensity for genetic drift, what are the most critical considerations when assigning a newly discovered coronavirus to a specific species within the Alphacoronavirus genus, ensuring both phylogenetic accuracy and clinical relevance?

<p>Employing a polyphasic approach integrating whole-genome phylogenetic analysis, comparative genomics focusing on conserved replicase domains, and in vitro host range studies. (D)</p> Signup and view all the answers

In binomial nomenclature, alterations to the originally designated species name of an organism are strictly prohibited, even if subsequent phylogenetic analyses reveal that the organism is more closely related to a different genus, thereby emphasizing the historical priority over contemporary taxonomic accuracy.

<p>False (B)</p> Signup and view all the answers

A novel eukaryotic organism is discovered, and initial genetic sequencing indicates a high degree of mosaicism with genes derived from disparate phyla. Describe the bioinformatic and phylogenetic methods necessary to rigorously determine its correct classification, including the challenges presented by lateral gene transfer and the criteria for establishing a stable taxonomic placement.

<p>To classify the organism, one must employ methods such as: 1. Phylogenomic analysis using multiple conserved, single-copy genes to minimize the impact of LGT, 2. Reconciliation analysis to identify and exclude horizontally transferred genes, 3. Statistical support methods to determine its placement within existing taxonomic frameworks, 4. Comparative genomics with organisms across the mosaic contributions to identify the evolutionary history of the species and validate its unique features.</p> Signup and view all the answers

When classifying organisms using binomial nomenclature, the principle of ________ dictates that the earliest published and validly described name for a taxon takes precedence, thereby ensuring stability and minimizing taxonomic confusion in the scientific literature.

<p>priority</p> Signup and view all the answers

Match each scenario with the most appropriate action required to adhere to the rules of binomial nomenclature and maintain taxonomic integrity:

<p>A species is found to consistently hybridize in nature, producing fertile offspring. = Designate distinct formae or subspecies to differentiate between the hybrid and non-hybrid populations A previously described species is demonstrated to be a junior synonym of an older, validly published name. = Suppress the junior synonym in favor of the older, valid name, establishing precedence Significant morphological and genetic divergence is observed within a currently recognized subspecies. = Elevate the subspecies to full species status, providing revised descriptions and justification A typographical error is discovered in the originally published species epithet. = Correct the error in subsequent publications, citing the original source and providing an erratum</p> Signup and view all the answers

Within the framework of evolutionary biology, which criterion would be most critical when re-evaluating the taxonomic assignment of two morphologically similar but geographically isolated insect populations to either distinct species or conspecific status?

<p>Quantification of pre- and post-zygotic isolation mechanisms with rigorous statistical validation within a common garden experiment, incorporating assessment of sperm competition and cryptic female choice. (D)</p> Signup and view all the answers

The persistence of paraphyletic groupings within contemporary phylogenetic classifications represents a methodological artifact solely attributable to incomplete taxon sampling and analytical limitations inherent in cladistic algorithms.

<p>False (B)</p> Signup and view all the answers

Propose a refined experimental methodology to conclusively differentiate between sibling species exhibiting cryptic morphological and behavioral similarities, thereby surmounting limitations of traditional taxonomic approaches.

<p>Integrative approach combining high-throughput sequencing of multiple genomic regions (RAD-seq, ddRAD-seq) with experimental reproductive compatibility assays under varying environmental conditions (temperature, humidity, photoperiod) to quantify pre- and post-zygotic isolation. Incorporate advanced bioacoustic analysis of mating calls and cuticular hydrocarbon profiling using GC-MS coupled with machine learning algorithms for accurate species delimitation.</p> Signup and view all the answers

The principle of __________ in phylogenetic reconstruction posits that, in the absence of compelling evidence to the contrary, the evolutionary pathway requiring the fewest character state transitions is most likely to reflect the true historical trajectory.

<p>parsimony</p> Signup and view all the answers

Match the following taxonomic ranks with their corresponding definitions within the Linnaean classification system:

<p>Kingdom = The highest taxonomic rank, grouping organisms based on fundamental characteristics (e.g., cell structure, mode of nutrition). Phylum = A taxonomic rank grouping organisms within a kingdom that share a common body plan or developmental pattern. Class = A taxonomic rank grouping organisms within a phylum that share common physiological and morphological traits, often reflecting shared ecological niches. Order = A taxonomic rank grouping organisms within a class that exhibit similar adaptive strategies and evolutionary relationships, often characterized by specific anatomical features.</p> Signup and view all the answers

In the context of modern phylogenomics, what best describes the underlying rationale for employing coalescent-based species delimitation methods, such as Bayesian Phylogeographic and Phylogenetic Analysis (BP&P), over traditional morphology-based taxonomic assignment?

<p>Coalescent models inherently accommodate incomplete lineage sorting and gene tree discordance, thereby mitigating the confounding effects of ancestral polymorphism and horizontal gene transfer prevalent in rapidly evolving lineages, while morphology-based approaches often overemphasize subtle phenotypic variations. (A)</p> Signup and view all the answers

Horizontal gene transfer (HGT) exclusively impacts prokaryotic evolution and exerts negligible influence on the phylogenetic relationships of eukaryotes due to their complex cellular organization and robust DNA repair mechanisms.

<p>False (B)</p> Signup and view all the answers

What is the fundamental distinction between cladistic and phenetic approaches to phylogenetic reconstruction, and how does this distinction impact the interpretation of evolutionary relationships?

<p>Cladistics exclusively considers shared derived characters (synapomorphies) to infer phylogenetic relationships, while phenetics relies on overall similarity (both ancestral and derived traits), resulting in cladograms that reflect evolutionary history versus phenograms that depict phenotypic resemblance. (D)</p> Signup and view all the answers

Flashcards

Binomial Nomenclature

A two-part naming system for species; includes the genus and species.

Genus

The first part of a scientific name, always capitalized.

Species

The second part of a scientific name, always lowercase.

Taxonomy

The science of classifying living organisms.

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Coronavirus example

Genus: Alphacoronavirus, Species: alphacoronavirus 1

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Biological Classification

Organizing living things based on shared traits and evolutionary history.

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Species Definition

A group of organisms that can breed and produce fertile offspring.

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Kingdom

The broadest classification group, based on general similarities.

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Taxonomic Ranks

A system arranging organisms into groups based on similarities.

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Genus name

The first part of a scientific name

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Species name

The second part of a scientific name

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Binomial Nomenclature capitalization

Always capitalize the first word (genus) and use a lowercase letter for the second word (species).

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Writing Scientific Names

Underline if handwritten, italicize if typed

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Apple Genus

Apple's genus = Pyrus

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Why Classify?

Organizing living things based on shared traits and evolutionary history.

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What is a Species?

Group of organisms that can interbreed and produce fertile offspring.

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Binomial System

A two-part naming system for species using genus and species names.

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Phylum

A classification rank grouping organisms in a kingdom based on general characteristics.

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Class

A classification rank grouping organisms in a phylum based on similarities.

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Order

A classification rank grouping organisms in a class, showing closer relationships.

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Family

A classification rank grouping organisms in an order that share many common traits.

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Genus (in nomenclature)

The first part of a scientific name. Always capitalized.

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Species (in nomenclature)

The second part of a scientific name, specific within the genus. Lowercase.

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Taxonomy Definition

The science of classifying and naming organisms.

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Banana Genus

A banana's genus is Musa.

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Cat Genus

A cat's genus is Felis.

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Carrot Genus

A carrot's genus.

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Dog Genus

A dog's genus is Cannis.

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Coronavirus Genus

Genus: Alphacoronavirus

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Naming System purpose

A naming system to separate species from each other.

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Classification in Biology

Sorting plants and animals into groups based on observed similarities.

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Kingdom (Taxonomy)

The broadest taxonomic group, containing organisms with general similarities.

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Five Kingdoms of Life

Animals, plants, protists, monera, and fungi.

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Binomial Nomenclature System

A system where each organism's scientific name has two parts: genus and species.

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Species (Taxonomy)

The most specific category of classification; organisms can interbreed.

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Kingdom Description

The broadest category grouping organisms with very general similarities.

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Phylum Description

A classification grouping organisms in the same kingdom based on general characteristics.

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Class Description

A classification grouping organisms in the same class based on more specific similarities.

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Why Use Binomial Nomenclature?

A classification system that uses two names: genus and species.

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Scientific Name Parts

The two components of a scientific name: the genus and species.

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Apple Scientific Name

Apple's genus is Pyrus, specifically Pyrus maleus.

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Linnaeus's System

Formal naming system of living things using 2 latin names

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What defines a Species?

A fundamental unit where members can interbreed & have fertile offspring.

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Animal Kingdom Examples

Animals like cats, dogs, elephants, and beetles.

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What is a Kingdom?

The broadest category in biological classification.

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Study Notes

  • The classification system in biology organizes and categorizes living organisms
  • Organisms are grouped based on shared features and evolutionary relationships

Species Definition

  • A species is a group of organisms that can interbreed and produce fertile offspring

Binomial System

  • Carl Linnaeus developed the binomial system for naming species
  • Each name includes the genus and the species
  • Example: Homo sapiens, where "Homo" is the genus and "sapiens" is the species
  • Binomial system ensures accurate identification and clear communication in the scientific community

Classification Definition

  • Classification is the arrangement of animals and plants into taxonomic groups based on observed similarities
  • Classification makes the identification of living organisms easier
  • Kingdom is the broadest group

Kingdoms of Life

  • Animal: cat, dog, elephant, beetle
  • Plant: banana, rice, durian
  • Protist: Paramecium, Volvox
  • Bacteria: E. coli
  • Fungi: yeast, mushroom

Taxonomic Ranks

  • Hierarchical system introduced by Carolus Linnaeus:
    • Kingdom: Broadest category, grouping organisms with general similarities
    • Phylum: Groups organisms in the same kingdom based on general characteristics
    • Class: Groups organisms in the same phylum based on more specific similarities
    • Order: Groups organisms in the same class, showing closer relationships
    • Family: Groups organisms in the same order, sharing many common traits
    • Genus: A group of closely related species
    • Species: Most specific category, organisms that can interbreed and produce fertile offspring

Grouping

  • Species are grouped into genera
  • Each genus contains species with similar characteristics
  • Genera are grouped into families, families into orders, orders into classes, classes into phyla, and phyla into kingdoms

Historical Classifications

  • Carl Linnaeus established two kingdoms of life: animal and plant
  • Robert Whittaker established five kingdoms of life: animal, plant, protist, monera, and fungus

Binomial Nomenclature Explained

  • The binomial nomenclature is an internationally agreed system
  • The scientific name consists of two parts showing the genus and species
  • Provides a unique name to organisms, including plants, animals, microorganisms
  • Naming system makes it easier to understand organisms and separates each species from others

Rules of Binomial Nomenclature

  • The scientific name has two parts: genus and species
  • Example: Felis catus (Felis - Genus name, catus - Species name)
  • Always capitalize the genus name and use a small letter for the species name
  • Scientific names should be in italics (computer) or underlined (handwritten)

Examples of Genus and Species

  • Apple: Pyrus maleus
  • Banana: Musa paradiscium
  • Camel: Camelus camelidae
  • Carrot: Daucas carota
  • Cat: Felis catus
  • Deer: Artiodactyl cervidae
  • Dog: Cannis familiaris
  • Dolphin: Delphinidae delphis

Taxonomy Definition

  • Taxonomy is the science of classification, specifically biological classification of living and extinct organisms
  • Term is derived from the Greek taxis (arrangement) and nomos (law)
  • Linnaeus introduced the binomial nomenclature system
  • All living things are given two names written in Latin, with the genus capitalized and the species in lowercase

Examples of Taxonomy

  • Homo sapien (human)
  • Mangifera indica (mango)

Coronavirus Example

  • Genus: Alphacoronavirus
  • Species: alphacoronavirus 1, humancoronavirus 229E

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Description

Learn about biological classification systems, including species definition and the binomial system. Explore the organization of living organisms based on shared features and evolutionary relationships. Discover the kingdoms of life: Animal, Plant, Protist, Bacteria, and Fungi.

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