A. Genetic drift refers to a. change in the way the body functions as a result of stressors. b. changes in the DNA sequence, particularly in sex cells. c. random changes or accidents that reduce genetic variation in a population. B. All human cultures a. can be correlated with "races" in the past. b. are unchanging and eternal. c. can be ranked as "primitive" or "advanced". d. are integrated and complex. d. exchange of genes when outsiders migrate into an area.

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Genetic Evolution

Sexual reproduction produces distinct population variations. Heredity determines the traits and qualities to be passed down to the progeny. Over time, this variation within-species is also affected by the process of human evolution. The study of how genetic variation leads to evolutionary changes is known as genetic evolution. If a trait helps an organism to survive and reproduce, it is more likely to be passed down the generations. It is rare that such traits result in a completely distinct set of traits in descendants than the ancestral population; this can result in the emergence of a new species.