Yahoo Answers is shutting down on 4 May 2021 (Eastern Time) and the Yahoo Answers website is now in read-only mode. There will be no changes to other Yahoo properties or services, or your Yahoo account. You can find more information about the Yahoo Answers shutdown and how to download your data on this help page.
please help explain to me, easy question?
Use the following information to answer the questions below. A large population of laboratory animals has been allowed to breed randomly for a number of generations. After several generations, 49 percent of the animals display a recessive trait (aa), the same percentage as at the beginning of the breeding program. The rest of the animals show the dominant phenotype, with heterozygotes indistinguishable from the homozygous dominants.
4) What is the most reasonable conclusion that can be drawn from the fact that the frequency of the recessive trait (aa) has not changed over time?
A) There has been a high rate of mutation of allele A to allele a.
B) The population is undergoing genetic drift.
C) There has been sexual selection favoring allele a.
D) The two phenotypes are about equally adaptive under laboratory conditions.
E) The genotype AA is lethal.
the answer is D. but i still don't understand.
1 Answer
- 1 decade agoFavourite answer
It just means that the recessive homozygous trait is has an equal amount of fitness to the dominant homozygous trait. The trait must be very similar or not noticeable by the animals and does not influence sexual selection.Over the generations this trait has not needed to be selected against and will still be around in the same amount because it has no reason not to be.
Hope this helps
~Matt
