A scientist working in an isolated rainforest is collecting picture winged flies
ID: 177765 • Letter: A
Question
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
40) answer is C. Conclusion of female choice experiment says that female choice acting on tail length, female founds tails most attractive that are longer than those found in normal setting. Tail is used to attract female rather than the display direct competition among mail. In this experiment , tail of one randomly selected male cut to about 14 cm in length then this removed feather glued with another male elongating the tail by 20 to 30 cm, and two male choose as a control one is normal tail and other has tail cut and repaired with glue.So, female choose mostly the elongated male than nonaugmented control bird or birds with shortened tail.
Answer 39. Answer is D.
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