Question

there are prerequisites for natural selection to take place. can you identify them? check all that are correct. what are the prerequisites for natural selection to take place? (choose 3) a in a given population genetic variation must exist. b variations within a population are always the result of dna mutations. c in a given population, more offspring are produced than can survive. d reproduction within a population is differential. e in any population natural selection can only occur if there is sexual reproduction. f inherited traits that provide an advantage will lead to death and possible extinction.

Explanation:

• Option A: Genetic variation in a population is essential for natural selection, as it provides the raw material for selection to act on.
• Option B: Variations can also arise from gene flow (e.g., migration) or genetic recombination (in sexual reproduction), not just DNA mutations, so this is incorrect.
• Option C: Overproduction of offspring creates competition for resources, which is a key prerequisite for natural selection (some will survive and reproduce, others won't).
• Option D: Differential reproduction means that individuals with advantageous traits are more likely to reproduce, passing on those traits, which is central to natural selection.
• Option E: Natural selection can occur in asexually reproducing populations (e.g., bacteria with genetic variation and differential survival/reproduction), so this is incorrect.
• Option F: Advantageous traits should increase survival and reproduction, not lead to death/extinction, so this is incorrect.

Answer:

A. In a given population genetic variation must exist.
C. In a given population, more offspring are produced than can survive.
D. Reproduction within a population is differential.