18 Questions
What is the term used to describe a grouping of organisms that share a common ancestor and all of its descendants?
Monophyletic
In a cladogram, what is the term used to describe the most distantly related species that serves as a reference group?
Outgroup
Which of the following is NOT a type of character used in constructing a cladogram?
Analogous structure
Which of the following is the best way to determine the evolutionary relationships among a group of mammals based on molecular data?
Analyzing the DNA sequences of a small section of a gene
Which of the following is the correct definition of a paraphyletic grouping?
A common ancestor and some of its descendants
What is the term used to describe a grouping of organisms that have no recent common ancestor?
Polyphyletic
What is the primary purpose of a dichotomous key?
To divide organisms into two contrasting groups repeatedly
Which of the following is the correct order of taxonomic levels from most inclusive to least inclusive?
Domain, kingdom, phylum, class, order, family, genus, species
Who devised the hierarchical classification scheme and binomial nomenclature system?
Carolus Linnaeus
Which of the following is the primary purpose of cladistics?
To define groups by distinguishing between ancestral and derived characters
Which of the following is not one of the three domains in the Linnaean classification system?
Protista
What is the primary purpose of a phylogenetic tree?
To determine the evolutionary history of a group of organisms
In a population of butterflies, the allele for the color brown (B) is dominant over the color white (b). If 60% of all butterflies are heterozygous, what is the percentage of homozygous dominant individuals in the population?
20%
If 18% of a population of laboratory mice are homozygous dominant for a certain trait, what percentage of the population is heterozygous?
27%
Considering the allele for a widow's peak is dominant over the allele for a straight hairline, if 70 individuals are expected to be heterozygous, how many individuals would you expect to be homozygous dominant for the trait in a population of 300?
140
If 20% of a population exhibit the recessive phenotype for a certain trait, how many individuals in a population of 500 would you expect to be homozygous recessive?
90
Given that 45% of a population of butterflies are homozygous dominant, what percentage of butterflies are expected to be heterozygous?
30%
In a large population of laboratory mice, if 28% are heterozygous for a certain trait, what percentage of mice would you expect to exhibit the homozygous recessive phenotype?
12
Test your knowledge on the Linnaean System of Classification devised by Carolus Linnaeus and the taxonomic levels used in biology. Learn about the hierarchy of categories from domain to species, and how organisms are grouped based on similarities and differences.
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