BIOL 103 Lecture Notes - Lecture 8: Frequency-Dependent Selection, Genetic Drift, Inbreeding Depression
28 Apr 2016
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Document Summary
Mutation: somatic mutation, difficult to measure effect of rate of mutation, a lot of mutations that occur can be fixed by error correcting machinery in the body. Sexual reproduction: constantly reshuffling variation, new combinations genetically variable offspring, crossing over phenomenon. Every gamete produced is unique (except identical twins) Female able to reproduce asexually well adapted to the local environment that the female lives in hidden assumption is that the environment doesn"t change, but it probably will. Offspring sexually with random male less adapted to the females environment. Pathogens are often smaller can reproduce faster. Large organisms need to keep up with smaller faster producing parasites. Populations of fruit flies genetic variation in enzymes traced back to different genetic alleles. Random changes of allele frequencies in small populations, often due to sampling = genetic drift. Decreases genetic variation within a population; may increase differences between populations.
