PCB 4674 Lecture Notes - Lecture 21: Sexual Selection, Robert Trivers, Parental Investment
21 Dec 2016
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Chapter 11: sexual selection: asymmetries in sexual reproduction. Sexual selection often does tend to act on the two different species in different ways: robert trivers (1972) built on this, hinging on one relatively simple observation: In many animals, eggs (or pregnancies) are far more metabolically expensive for the mother than ejaculating is for the father. Mothers typically make a larger parental investment in each offspring than the fathers doin. Parental investment: energy and time expended constructing and caring for the offspring: measured in fitness. Parental investment needs to act in a way that increases the reproductive success of the offspring receiving said investments. Decreases the remaining reproductive success that the parent may achieve in the future by way of additional offspring. Consider: orangutans: adults only get along long enough to mate. If mother gets pregnant, she will carry the fetus for.
