PSYCH 2TT3 Lecture 11: Lecture 11 (Chapter 6) - April 1- PSYCH 2TT3
9 Sep 2013
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Document Summary
Males and females look different because of sexual selection differences driven by selective force: males often more colorful, more ornamented (eg/ antlers) Intrasexual selection when one sex of the species compete for mates. Intersexual selection individual chooses a mate from the opposite sex. Natural selection differential survival and/or reproduction of individuals differing in one or more heritable traits: changes of the frequency of a trait, changes in a characteristic of a population due to variation of fitness of traits. Sexual selection differential reproduction owing to variation in the ability to obtain mates by individuals differing in one or more heritable traits: variants in reproductive success, owing to one or more traits. Optimal gamete size: gamete = egg or sperm. Favours small and quick, and large and slow gametes - intermediate gametes are unsuccessful; not fast or healthy enough. Frequency = bimodal distribution with small and large gametes.
