BIO 185 Lecture 4: Lecture 4
Document Summary
2/10/15 exam - mostly short answer questions and analyzing lab data chapter 22, 23, 24, 25, phylogeny part of 26 need to refresh of sexual reproduction, gametes, etc. See concept 13. 4 (just be able to explain how it leads to variation in the population). Answers: environmental factors (chemicals - carcinogens, uv radiation), dna replication error. Mutation in dna in eggs and sperm (just because you get a mutation from uv radiation that causes skin cancer, does not mean your children will get skin cancer) Agents of evolution (change in allele frequency!: mutation (random, migration (random) Genetic drift: random changes in the gene frequency due to chance (example: squashing. Owers, re, natural disaster, etc. ) genetic drift (random) changes in variation (allele frequency) due to random/chance events impacts smaller populations more signi cantly. Founder effect can lead to genetic drift - chance event (random) No because gene ow and genetic drift are random events.
