Anthropology 2265F/G Lecture Notes - Lecture 9: Common Chimpanzee, Reciprocal Altruism, Gray Langur

• School: Western University
• Department: Anthropology
• Course: Anthropology 2265F/G
• Professor: Ian Colquhoun

Document Summary

Lecture 9: growth, development, and life-history: behaviour over the life-course. Thus, a series of stepwise improvements (arrows) may lead to a local optimum (centre) rather than to the highest peak (far right). Here, the phenotype is represented by just two dimensions. In reality, there might be many dimensions, and fitness might be plotted against a discrete genotype rather than a continuous phenotype. Primate males are heterogametic that is, the sperm of a primate male can carry either an x or y chromosome. Primate female are homogametic all female ova (singular = ovum) carry only an x chromosome. X and y-bearing sperm would be slightly different in weight (x-bearing sperm would be slightly heavier). X and y-bearing sperm are thought to vary in their motility (i. e. , ability to move), and may be subject to differential survival. Similarly, xx (female) vs. xy (male) zygotes can have differential survival.