WFC 154 Lecture Notes - Lecture 17: Zygosity

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Calculate for two populations of 100 animals. Many fish, amphibians, and plants have high variation in reproductive output. Where t=# generations and nt is a number of breeding individuals at time t. Even if we have good years, the average ne is still low. Ultimate source of new alleles in the population. Given large number of genes in most species, deleterious mutation may arise in 1 gamete per generation. Decreasing population size increase risk of fixation of deleterious mutations. Random fluctuation of gene frequencies over time due to chance alone. Each parent passes only one copy (allele) of their genes to offspring. Drift can lead to rapid loss of variation. Rate of loss from drift is usually slower than time frame for conservation action. Adaptive alleles are under selection pressure and are more likely to be retrained. Movement between populations ca greatly affect genetic variation. Only 1 immigrant per generation can counteract genetic drift.

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