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Behavioral Ecolog5

# Behavioral Ecolog5 - Let's now examine the case for...

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Behavioral Ecology Relatedness Among Diploid Animals The parent to offspring relationship is r=.5 because each parent has half its genes in the offspring. The offspring to parent relationship is also r=.5 because half the offspring's genes come from each parent. Full siblings are related by r=.5 and half siblings are related by r=.25. shows how to calculate relatedness. Figure %: Calculated relatedness among individuals There may be several paths of genetic transmission from one individual to another. The r's between each pair of individuals are multiplied along a path, and paths are summed to yield the total degree of relatedness. If the lineage of any path is uncertain, we multiply the uncertain path by the probability of guessing the correct lineage. For instance, a daughter's degree of relatedness to one of four men who all are equally likely to be her father is r=(.5)(1/4)=.125. Relatedness Among Haploiddiploid Animals
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Unformatted text preview: Let's now examine the case for haplodiploid organisms, such as ants, in which females inherit a set of genes from both parents, but males are haploid, resulting from unfertilized eggs, and receive only half of their mother's genes. Figure % Calculated relatedness among haplodiploid individuals As you can see in , the mother's relationship to her daughter, and the daughter's relationship to her mother, are still r=.5. A mother's relationship to her son is r=.5 because he received half of her genes, however the son's relationship to the mother is 1 because all of his genes are from his mother. A daughter's relationship to her father is r=.5 because half of her genes are from her father, but a father's relationship to his daughter is r=1 because she has all his genes since he only has one copy. There is no father/son relationship because males result from unfertilized eggs....
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