PopCycle.Tutorial.fm

PopCycle TutorialAn introduction topopulation geneticsPopulation genetics is the result of a marriage of Mendelian genetics with Darwinian natural selection. Mendelian genetics allows us to pre-dict the characteristics of the next generation within families. Popula-tion genetics will allow us to predict the characteristics of the next generation in whole populations.Genes in populationsRecall that in Mendelian genetics, we predict the genotypes of offspring by tracking alleles from parents to offspring. If both parents are carriers Software for Evolutionary Analysis © 2002 Jon C. Herron 1 2 An introduction to population geneticsfor cystic fibrosis, for example, they have genotype Cc. We can use a Cc Cc Punnett square to predict that they will have offspring with genotypes CC, Cc, and cc in a 1:2:1 ratio, and that the probability that any particu-lar child will have cystic fibrosis is 1 in 4.Possible eggs In population genetics, we will track alleles and genotypes across ?? the entire life cycle of a population. Sea urchins are a useful organism to Ccthink about. Sea urchins don’t copulate. Instead, males and females PossibleC CC Ccsperm simply release their sperm and eggs to float on the tide. The eggs and sperm, which we will think of as the gene pool, find each other more or c cC ccless at random and join to become zygotes. We will follow the zygotes Zygotes as they grow into juveniles, then adults. Finally, we will watch the adults ...