Biology CLEP Prep Practice Exam

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What is the source of genetic variation in populations?

Inherited mutations
Random mating
Climate change
Increased competition

The correct answer is: Inherited mutations

Genetic variation in populations refers to the differences in DNA sequences between individuals in a species. Since all members of a species have the same set of genes, it is the variations in these genes that make individuals unique. Option A, inherited mutations, is the correct answer because it refers to genetic changes that are passed down from parents to offspring. This is the primary source of genetic variation in populations. Options B, C, and D are incorrect because they do not directly contribute to genetic variations. Random mating, option B, can introduce new combinations of existing genes, but it does not create new genetic variations. Climate change, option C, may affect the survival and reproductive success of individuals in a population, but it does not directly cause genetic variations. Increased competition, option D, may lead to natural selection and survival of the fittest, but it does not contribute to the creation of new genetic variations