Exam 2 key 2010 - Avian Biology Exam 2 Answer Key Spring...

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Exam 2 Answer Key Spring 2010 1a) (Doug graded) The most likely explanation for non-breeding crows to help other individuals in their group is kin selection – they increase their fitness indirectly by helping raise individuals genetically related to them. (Some of you provided explanations for why individuals weren’t breeding; those explanations do not address why individuals helped.) b) “Socially monogamous’ means that a mated pair appears to be monogamous – that socially they interact almost exclusively with their mate. It does not imply, however, that the pair is genetically monogamous – they may mate with other individuals. c) The good genes hypothesis states that females seek extra-pair copulations to increase the genetic quality of their offspring, and hence their own fitness. Because most females are mated to “average” quality males, the only way for them to get better quality genes to look for higher quality males and mate with them. d) It weakens support for the hypothesis because the wider a female can search for high quality males (genes), the better chance she has of finding them. If she restricts herself to looking only within her family group, she is very much limiting her ability to find and mate with the very best quality male. e) The observation weakens support for the genetic diversity hypothesis, which would have predicted higher survivorship of young from brood with mixed parentage. However, as some of you pointed out, the data set provided is quite limited (only 6 months) and it may be the case that over a longer period of time with greater amounts of environmental variability the young from brood of mixed parentage would survive better han those from the more homogeneous (low diversity) groups. f) The most common answer was that the female mates with a variety of males in her group to increase their genetic relatedness to the young and, through kin selection, increase the likelihood of them providing help in raising the young. 2a) (Doug graded). Your power curve should have included labels for the x-axis (velocity), y-axis (power), Power-burst, Power-continuous, Power margin, and Velocity of minimum power. Because you were drawing a power curve of a small bird, the power margin should have been large and the y-intersect should have been obviously below the Power-burst line (see circled area below). Power - burst
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Exam 2 key 2010 - Avian Biology Exam 2 Answer Key Spring...

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