BIO 3115 Lecture Notes - Lecture 12: Genetic Drift, Inbreeding, Natural Selection
19 Mar 2018
School
Department
Course
Professor
Document Summary
Use mechanisms learned in class to explain trend. More likely to breed with genetically related individuals. All individuals have some risk of disease, homozygotic alleles can cause a disease to be unhidden. Eg that cat thing with a tail kink and low sperm count (puma/mountain lion) Kill of individuals with lethal alleles very quickly. Effects of inbreeding on juvenile mortality in captive populations of mammals. If no correlation, the line should be 1 to 1 but it is not. All data points show that juvenile mortality is higher in inbred than outbred. Smaller the pop faster the loss of genetic variability. Graph in slide showing how a small pop loses the original variation compared to generations. Mutations being a balancer to increase genetic diversity. Small pop from a group to colonize an area. Carry a small fraction of the genetic variation of parental pop. Genetic divergence from ancestral population occurs via drift, reduced heterozygosity in colonizing pop.
