LIFESCI 2D03 Chapter Notes - Chapter 3: Selective Breeding, Allele Frequency, Heritability
6 Sep 2018
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A(cid:374)i(cid:373)al behavior: variation in survivorship and reproduction is the raw material for adaptive evolution, although natural selection results in changes in populations, it acts on individuals that collectively make up those populations, rather than on the populations themselves. 3. 1 evolution by natural selection favours behavioural adaptions that enhance fitness: ex: dog breeds: All dog breeds have descended from the gray wolf, result of human manipulation of the breeding of individuals over the past 14,000 years. Selected individuals that possess certain traits for a particular breed. Reproduction only allowed among individuals that possessed certain traits. Differences in the breed standards over time eventually led to even greater differences among the dog breeders we see today. The trait values of the offspring are plotted against the trait values of the parent. The slope of the resulting regression indicates the heritability of the trait. Because individuals differ in their experience over their lifespan, we will observe differences in their behavior as well.
