ENV100Y5 Lecture Notes - Lecture 9: Adaptive Radiation, Selective Breeding, Doubling Time

• School: UTM
• Department: Environment
• Course: ENV100Y5
• Professor: Barbara Murck

Document Summary

Over time, populations may diverge and form new species. Change in the genetic composition of a population. Variants of a given gene are called alleles. For any given gene (locus), there may be one, a few, or many variants (alleles) in a population. Evolution is nothing more than a change in the genetics of a population. Someone brings in a new allele into a population, this new allele perpetuates throughout the population. Something in the environment dictates which alleles will make it to the next generation. Some variants are more likely to survive than others (depending on the environment) Survivors will reproduce and pass on those alleles to their offspring. Overtime the genetic composition of populations will change. Migration, drift, mutation, and selection, are all agents of evolution. Sometimes alleles get removed, causing genetic composition to change. Random events remove alleles from a population. Humans intentionally mimic natural selection: artificial selection. Humans can be unintentional agents of natural selection.