Please answer both parts Part A. Evolution cannot produce "perfect" organisms because: a. Mutations occur at random and are not often useful b. Selective pressures may change and/or may be in conflict with each other c. Past evolutionary history makes it impossible to go "back to the drawing board" d. All of the above e. None of the above Part B. The gene pool of a population (i.e., allele frequencies in a population) may change due to a. migration. b. a bottleneck. c. genetic drift. d. disruptive selection. e. all of the above are correct.

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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.