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144_3assignment_2009_Lacey_answers - IB 144/Psych 115B Fall...

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IB 144/Psych 115B Name ________________________ Fall 2009 Section day & time _____________ ASSIGNMENT 3 Due week of 21 September 2009 10 points As discussed in lecture, kinship is an important concept that is thought to contribute to adaptive explanations for many aspects of animal behavior. The pedigree shown below is from a serially monogamous species – during each breeding season, each male mates with only a single female, but both animals change partners between breeding seasons. Use this pedigree to answer the following questions. Note: this is a sexually reproducing, diploid species. 1. (3 pts) Calculate the coefficient of relatedness (r) between individuals A and B and between individuals A and C. Show all of your calculations. r A-B = 0.25 (half siblings who share a mother) r = 0.5 x 0.5 (one pathway, two links in the pathway) r A-C = 0! although the pedigree makes it look like A and C are related, think about the biology of this example … A and B share a parent and B and C share a parent but A and C do not have a parent in common. Thus, unless the different parents are themselves related (which would have to be indicated in the question to be fair), there is no actual biological link between A and C. The horizontal links between reproductive partners indicate that they 1
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reproduced together, not that they are related. In contrast, the vertical links between parents and offspring do reflect relatedness and alleles that are IBD.
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