NEED HELP ASAP BIO A scientist working in an isolated rainforest is collecting p
ID: 177574 • Letter: N
Question
NEED HELP ASAP BIO
A scientist working in an isolated rainforest is collecting picture winged flies. She notices that, for a widely-distributed and common type of fly, the markings on the wings vary greatly from one to location to the next. Her experiments demonstrate that females have a very strong preference for males with particular wing markings, and that the wing markings are probably due to a single locus with three codominant alleles. In the lab, offspring of crosses between the various wing types have similar survivorship, but, when females are given a choice, males with certain markings get all the mates. Which of the following is a reasonable conclusion? The flies are separate morphological species. The flies are separate biological species. The flies are under intense sexual selection for these wing patterns. The flies exhibit geographic variation for wing markings, which may be due to genetic drift, or to selective pressures she cannot reproduce in the laboratory. B and D. In the female choice experiment conducted on widow birds, what was the conclusion? Female choice was not a mechanism of sexual selection because all the birds failed to mate. Male-male competition was occurring because females were forced to choose males by the "fit must survive" principle. Female choice, acting on tail length, was easy to demonstrate because male birds that were augmented to have especially long tails had many more mates than non-augmented control birds, or birds with shortened tails. Sexual selection acts to maintain short tails in widow birds. C and D are correct.Explanation / Answer
Please find the answers and explanations below:
Part 39: Choice E (The description shows that the flies belong to different geographical locations hence show different biological patterns of wing designs. It is also shown that the female flies have specific tendency for a particular type of wing pattern for their males. This describes sexual selection of a particular morphological feature in the flies. Also, since flies of different wing patterns do not cross-breed even when provided chances, it clearly deciphers that these flies are not only geographically separated, but they are biologically different as well.)
Part 40: Choice E (The widow birds females show a sexual selection for males with long tails. The females are themselves equipped with short tails and find males with long tails fit enough to mate. This makes the population of females with short tails and males with long tails significantly increase in a population. Thus, sexual selection also maintains short tails in females and long tails in males)
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