BIOL 1020 Lecture 35: Lecture 35

• School: University of Manitoba
• Department: Biological Sciences
• Course: BIOL 1020
• Professor: Joy Stacey

Document Summary

One misconception is that organisms evolve, in the darwinian sense, during their lifetimes. Natural selections acts on individuals, but only populations evolve. Microevolution is a change in allele frequencies in a population over generations ** Mutation and sexual reproduction produce the genetic variation that makes evolution possible ** Two processes, mutation and sexual reproduction, produce the variation in gene pools that contributes to differences among individuals. Both discrete and quantitiative characters contribute to a variation within a population. Discrete characters can be classified on an either-or basis: mendel"s flowers. Quantitative characters vary along a continuum within a population. Most species exhibit geographic variation, difference between gene pools of separate populations or population subgroups: eg. Squirrels in winnipeg and squirrels in lake of the woods. Mutations are changes in the nucleotide sequences of dna. Mutations cause new genes and alleles to arise.