BIOL 241 Lecture Notes - Lecture 33: Parental Investment, Fecundity, Gamete
3 Apr 2016
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Theme 4c: the ways of change (drift, selection, and speciation) part i. Random processes : can afect the frequencies of geneic variants and traits during life cycle, especially very small populaion. From an evoluionary perspecive, such events will be random if their probability of occurrence is not afected by an individuals" phenotype. Geneic drit results from random sampleing and sampling error is higher with a small sample. Pick a few jelly beans diferent proporion than the bowl. Pick a large handful a proporion similar to the bowl. The consequences of random processes are more signiicant for small populations than for large populations. Geneic drit reduces geneic variaion in a populaion. Botlenecks : temporary declines in populaion size cause drit, and reduced geneic variaion signiicant conservaion implicaions. Northern elephant seal botleneck in the late 1800"s. Genetic drift deceases genetic variation in a population. All non- africans descend from a small populaion of humans who lived in.
