Evolution Key Concepts
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Questions and Answers

What is the primary mechanism by which individuals with favorable traits are more likely to survive and reproduce, leading to adaptation to the environment?

Natural selection

What is the process by which a new species emerges from an existing one, often occurring when a population becomes reproductively isolated from the rest of the species?

Speciation

What type of evolution focuses on the study of large-scale evolutionary changes that occur over long periods of time, including the formation of new species, genera, and higher taxonomic groups?

Macroevolution

What provides a chronological record of the history of life on Earth, supporting evolution through the presence of fossils of transitional forms and extinct species?

<p>The fossil record</p> Signup and view all the answers

What is the term for the random change in the frequency of a gene or genetic trait in a population, which can lead to the loss or fixation of a trait?

<p>Genetic drift</p> Signup and view all the answers

What is the movement of genes from one population to another, which can lead to changes in the gene pool of a population?

<p>Gene flow</p> Signup and view all the answers

What is the intentional breeding of organisms for specific traits, leading to rapid evolution of a species?

<p>Artificial selection</p> Signup and view all the answers

What is the study of the structure and development of body parts in different species, revealing homologous structures and supporting evolutionary relationships?

<p>Comparative anatomy</p> Signup and view all the answers

The ______ is the control center of the cell that contains genetic material.

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

The ______ generates energy for the cell through cellular respiration.

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

The ______ is the site of protein synthesis in a cell.

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

[Blank] transport is the movement of molecules from high to low concentration without energy.

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

The ______ is the process of cell division resulting in four non-identical daughter cells.

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

Eukaryotic cells have a ______ that contains genetic material.

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

The ______ is the jelly-like substance inside the cell membrane that contains organelles.

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

The ______ is the semi-permeable membrane that regulates what enters and leaves the cell.

<p>cell membrane</p> Signup and view all the answers

Study Notes

Evolution

Definition and Overview

  • Evolution: the scientifically supported theory that all species of life have developed from a common ancestor through the process of natural selection, genetic drift, mutation, and gene flow
  • Describes the change in the characteristics of a species over time

Key Concepts

  • Natural Selection:
    • Process by which individuals with favorable traits are more likely to survive and reproduce, passing those traits to their offspring
    • Leads to adaptation to the environment
  • Speciation:
    • The process by which a new species emerges from an existing one
    • Often occurs when a population becomes reproductively isolated from the rest of the species
  • Macroevolution:
    • The study of large-scale evolutionary changes that occur over long periods of time
    • Focuses on the formation of new species, genera, and higher taxonomic groups
  • Microevolution:
    • The study of small-scale evolutionary changes that occur within a population over a relatively short period of time
    • Focuses on changes in gene frequency and adaptation to the environment

Evidence for Evolution

  • Fossil Record:
    • Provides a chronological record of the history of life on Earth
    • Fossils of transitional forms and extinct species support evolution
  • Comparative Anatomy:
    • The study of the structure and development of body parts in different species
    • Reveals homologous structures, which are similar in structure but may have different functions
  • Molecular Biology:
    • The study of DNA and protein sequences
    • Reveals similarities and differences between species, supporting evolutionary relationships
  • Biogeography:
    • The study of the geographic distribution of species
    • Supports evolution by showing that species are found in areas where they could have evolved from a common ancestor

Mechanisms of Evolution

  • Mutation:
    • A change in the DNA sequence of an individual
    • Can result in new traits or changes to existing traits
  • Genetic Drift:
    • The random change in the frequency of a gene or genetic trait in a population
    • Can lead to the loss or fixation of a trait
  • Gene Flow:
    • The movement of genes from one population to another
    • Can lead to changes in the gene pool of a population
  • Artificial Selection:
    • The intentional breeding of organisms for specific traits
    • Can lead to rapid evolution of a species

Evolution

Definition and Overview

  • Evolution is the scientifically supported theory that all species of life have developed from a common ancestor.
  • It describes the change in characteristics of a species over time through natural selection, genetic drift, mutation, and gene flow.

Key Concepts

Natural Selection

  • The process by which individuals with favorable traits are more likely to survive and reproduce, passing those traits to their offspring.
  • Leads to adaptation to the environment.

Speciation

  • The process by which a new species emerges from an existing one.
  • Often occurs when a population becomes reproductively isolated from the rest of the species.

Macroevolution

  • The study of large-scale evolutionary changes that occur over long periods of time.
  • Focuses on the formation of new species, genera, and higher taxonomic groups.

Microevolution

  • The study of small-scale evolutionary changes that occur within a population over a relatively short period of time.
  • Focuses on changes in gene frequency and adaptation to the environment.

Evidence for Evolution

Fossil Record

  • Provides a chronological record of the history of life on Earth.
  • Fossils of transitional forms and extinct species support evolution.

Comparative Anatomy

  • The study of the structure and development of body parts in different species.
  • Reveals homologous structures, which are similar in structure but may have different functions.

Molecular Biology

  • The study of DNA and protein sequences.
  • Reveals similarities and differences between species, supporting evolutionary relationships.

Biogeography

  • The study of the geographic distribution of species.
  • Supports evolution by showing that species are found in areas where they could have evolved from a common ancestor.

Mechanisms of Evolution

Mutation

  • A change in the DNA sequence of an individual.
  • Can result in new traits or changes to existing traits.

Genetic Drift

  • The random change in the frequency of a gene or genetic trait in a population.
  • Can lead to the loss or fixation of a trait.

Gene Flow

  • The movement of genes from one population to another.
  • Can lead to changes in the gene pool of a population.

Artificial Selection

  • The intentional breeding of organisms for specific traits.
  • Can lead to rapid evolution of a species.

Cells

Definition and Structure

  • A cell is the basic structural and functional unit of life.
  • A cell consists of a cell membrane (plasma membrane), cytoplasm, and a nucleus.
  • The cell membrane is semi-permeable and regulates what enters and leaves the cell.
  • Cytoplasm is a jelly-like substance inside the cell membrane that contains organelles.
  • The nucleus is the control center of the cell and contains genetic material (DNA).

Cellular Organelles

  • Mitochondria generate energy for the cell through cellular respiration.
  • The Endoplasmic Reticulum (ER) synthesizes and transports proteins and lipids.
  • Ribosomes are the site of protein synthesis.
  • Lysosomes contain digestive enzymes that break down and recycle cellular waste.
  • The Golgi Apparatus processes and packages proteins and lipids for transport.

Cellular Functions

  • Metabolism involves cells carrying out chemical reactions to maintain life.
  • Transportation in cells involves moving materials in and out through passive and active transport.
  • Cellular communication involves cells responding to signals through signaling pathways.
  • Growth and development involve cells dividing, differentiating, and specializing to form tissues.

Cell Types

  • Prokaryotic cells lack a nucleus and are typically single-celled organisms, such as bacteria.
  • Eukaryotic cells have a nucleus and can be single-celled or multi-celled organisms, such as plants and animals.

Cell Division

  • Mitosis is the process of cell division that results in two identical daughter cells.
  • Meiosis is the process of cell division that results in four non-identical daughter cells (gametes).

Cellular Transport

  • Passive transport involves the movement of molecules from high to low concentration without energy.
  • Diffusion is the random movement of molecules from high to low concentration.
  • Osmosis is the movement of water through a selectively permeable membrane.
  • Active transport involves the movement of molecules from low to high concentration using energy.

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Understand the fundamentals of evolution, including natural selection, genetic drift, and mutation. Learn how species change over time through the process of evolution.

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