ANTH305 Lecture Notes - Lecture 5: Genetic Drift, Selective Breeding, Sexual Selection

• School: University of Delaware
• Department: Anthropology
• Course: ANTH305
• Professor: Dettwyler Katherine

Document Summary

Random genetic drift: random reduction in variation that isn"t related to the genes you cary, 1. Humans deciding based on certain factors would be artificial: 2. Cultural beliefs and practices: ex: nuns and priests. Parents only pass along 1 of 2 genes per each allele: 4. When small group leaves a population to start a new one. Founders wont carry all variation in the original population. If one or 2 founders have a rare allele it will become more common: ex: martha"s vineyard defnes. Processes that produce genetic variation within populations: 1. Indirect: increase variation without changing allele frequencies. Crossing over: new combinations of alleles on chromosomes, occurs during meiosis between 2 members of homologus pair of chromosomes. Direct: increase variation by direct change in allele frequencies. A. mutations: change in allele at chemical level, advantages- makes better functioning allele, neutral- doesn"t effect allele, disadvantages- disrupts function.