Evolution and Genetics

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What role does genetic variation play in the evolution of species?

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It increases the chance that species will possess characteristics well-suited for a changing environment.

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Factors that control traits are called

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genes.

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Why is DNA important?

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It serves as the blueprint for traits of all living things.

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Genetic instructions are passed from both parents to their...

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offspring.

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How many pairs of chromosomes do humans have?

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23.

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What is evolution?

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The process by which species change over time through genetic variation and natural selection.

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What is natural selection?

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The process where organisms better adapted to their environment tend to survive and produce more offspring.

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What are alleles?

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Different forms of a gene that can exist at a specific locus on a chromosome.

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What is a genotype?

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The genetic constitution of an individual, represented by the alleles they possess.

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What is a phenotype?

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The observable physical or biochemical characteristics of an organism, determined by its genotype.