BIOL 2050 Chapter Notes - Chapter 18 (18.1-18.3): Equilibrium Point, Selection Coefficient, Population Bottleneck
Document Summary
18. 1 genotypic and allelic frequencies are used to describe the gene pool of a population. Genetic variation is the basis of all evolution, and the extent of genetic variation within a population affects its potential to adapt to environmental change. Theres a lot of variation at the molecular level, due to the redundancy of the genetic code. So, 2 organisms can produce the same protein even if their dna sequences are different. To calculate a genotypic frequency, we must add up the # of individuals possessing a genotype and divide by the total number of individuals in the sample (n) * sum of all genotypic frequencies = 1. Calculating allelic frequencies there are fewer alleles than genotypes genotypes break down each generation and individual alleles are passed to the next generation through gametes. So, the types and numbers of alleles (not genotypes) have real continuity from one generation to the next.
