Question

a model of evolution is shown here. the original population has alleles for type a blood (red) and alleles for type b blood (blue).which statements are supported by the information in the model? please select all that apply. a the genetic diversity for islands a and c is reduced after genetic drift. b the founder effect is a mechanism of evolution that includes a random factor that influences allele changes. c islands a and c had founding members with identical allele combinations as the original mainland population. d the members of the founding population for island b are the most representative of the original population on the mainland. e islands a and c have undergone natural selection, which reduced the genetic variation of the alleles on each of those two islands.

Explanation:

• Option A: Island A has only red (type A allele) and Island C has only blue (type B allele), while the original population had both. So their genetic diversity is reduced (genetic drift via founder effect), so A is correct.
• Option B: Founder effect is a type of genetic drift (random change in allele frequencies due to a small founding population), so it includes a random factor, B is correct.
• Option C: Island A has only type A alleles, Island C has only type B alleles, original had both. So their allele combinations are not identical to original, C is incorrect.
• Option D: Island B has both red and blue alleles, similar to the original population's allele representation, so D is correct.
• Option E: The change here is due to founder effect (genetic drift), not natural selection (which is non - random, based on fitness). So E is incorrect.

Answer:

A. The genetic diversity for islands A and C is reduced after genetic drift.
B. The founder effect is a mechanism of evolution that includes a random factor that influences allele changes.
D. The members of the founding population for island B are the most representative of the original population on the mainland.