This preview shows pages 1–3. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: 1 Lecture 5 Hardy-Weinberg Equilibrium and Mechanisms of Evolution Odds and Ends Monday Finish CH 23 (natural &amp; sexual selection) + some of HW practice problems CH 24 Wednesday Mastering Biology website folder includes link to website and directions for logging on, I did not set up a course ID Recommend Mastering Biology Exercises for CH23 Activity 23.1-sexual recombination video Activity 23.2-Practice HW Activity 23.3-Mechanisms of evolution Hardy-Weinberg Equilibrium Assumptions Both allele and genotype frequencies remain constant across generations if: 1. Mating is random 2. Mutations do not occur 3. There is no genetic drift (book &quot;large population size&quot; 4. There is no migration (aka &quot;no gene flow&quot;) 5. There is no natural selection Road Map: Five Means of Evolution 1. Non-random mating 2. Mutations 3. Genetic drift 4. Migration = gene flow 5. Natural selection sexual selection + 2 Non-Random Mating 1. Assortative Mating positive assortative mating = preferring same genotype inbreeding - mating with genetic relatives is one form of positive assortative mating negative assortative mating or disassortative mating = preferring different genotype 2. Sexual Selection (later) =Aa OR (+) aA From Punnett squares 1. all frequencies must sum to 1 2. AND = MULTIPLY 3. OR = ADD Random Mating Road Map: Five Means of Evolution 1. Non-random mating 2. Mutations 3. Genetic drift 4. Migration = gene flow 5. Natural selection sexual selection + Mutations mutations alone = small effect (unless really small population) but with natural selection across generations = BIG EFFECT 2 Non-Random Mating 1. Assortative Mating positive assortative mating = preferring same...
View Full Document
- Spring '08