ch 16: popln genetics and speciation 16.1 genetic equilibrium - stable i.variation of traits within...
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Ch 16: Popln Genetics and Speciation16.1 Genetic Equilibrium - stableI. Variation of Traits Within a Popln
A. popln genetics – study of evoln from genetic point of view
B. microevoln – small scale – genetics of a population
C. Causes of variation 1. mutation2. recombination3. random pairing of gametes
II. Gene PoolA. defn – total genetic info of poplnB. allele frequency – how often allele (trait) appears in popln
16.2 Disruption of Genetic EquilibriumI. MutationII. Gene Flow
A. gene flow – moving genes from one popln to another
B. emigrationC. immigration
III. Natural Selection
Natural selectionin action
IV. Genetic Drift – allele frequencies change by chance
• V. Nonrandom Mating – mate selection - due to proximity, calling, etc
16. 3 Formation of SpeciesI. The Concept of Species
A. species – similar organisms that can reproduce and have fertile offspringB. speciation – making a new species
• Forming of species
II. Isolation and SpeciationA. Speciation begins with isolationB. Geographical isolation
1. physical separation2. canyons, mountain, water, etc
C. Reproduction Isolation1. prezygotic isolation – premating
isolation (before)a. mating call not recognizedb. mating times (frogs pg 329)
2. postzygotic isolation – postmatinga. offspring may dieb. offspring may not dev
completelyc. offspring may be infertile
III. Rates of SpeciationA. gradualism – slowlyB. punctuated equilibrium – rapid change in little periods
• Overview of theory of evolution
Tortoise