Evolution Chapter 20 Notes

NOTE 20A: Where eggs are laid is likely to depend on the mother’s genotype, whereas whether they will survive depends on their own genotype. In this example, the interests of parent and offspring are the same: We can assume that what is maximized is the number of surviving offspring produced by the mother. In Chapter 21, we look at examples where there are conflicts between parent and offspring, so that the outcome depends on whose genotype is in control (see p. 604).

NOTE 20B: At the ESS, if the population contains only individuals with survival {vA, vB}, then it cannot be invaded by individuals with any different survival.

NOTE 20C: This problem is similar to Problem 18.9. However, the previous problem assumed specific genetics, whereas this problem makes no assumptions about the inheritance of the traits.

NOTE 20D: This example is similar to the one in Partridge and Barton (1993). However, we simplify the algebra by assuming that the population size is regulated by density-dependent fecundity.

NOTE 20E: This problem is similar to Problem 19.9, which followed the hitchhiking effect of a favorable mutation on a linked neutral gene. Now, the linked gene is still neutral (because all females produce the same number of offspring), but it determines a strong female preference.