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Ch 16: Popln Genetics and Speciation 16.1 Genetic Equilibrium - stable I.Variation of Traits Within a Popln A. popln genetics – study of evoln from genetic.

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Presentation on theme: "Ch 16: Popln Genetics and Speciation 16.1 Genetic Equilibrium - stable I.Variation of Traits Within a Popln A. popln genetics – study of evoln from genetic."— Presentation transcript:

1 Ch 16: Popln Genetics and Speciation 16.1 Genetic Equilibrium - stable I.Variation of Traits Within a Popln A. popln genetics – study of evoln from genetic point of view

2 B. microevoln – small scale – genetics of a population

3 C. Causes of variation 1. mutation 2. recombination 3. random pairing of gametes

4 II. Gene Pool A. defn – total genetic info of popln B. allele frequency – how often allele (trait) appears in popln

5 16.2 Disruption of Genetic Equilibrium I.Mutation II.Gene Flow A. gene flow – moving genes from one popln to another B. emigration C. immigration III. Natural SelectionNatural Selection

6 Natural selection in action

7 IV. Genetic Drift – allele frequencies change by chance

8 V. Nonrandom Mating – mate selection - due to proximity, calling, etc

9 16. 3 Formation of Species I.The Concept of Species A. species – similar organisms that can reproduce and have fertile offspring B. speciation – making a new speciesspeciation

10 Forming of species

11 II. Isolation and Speciation A. Speciation begins with isolation B. Geographical isolation 1. physical separation 2. canyons, mountain, water, etc

12 C. Reproduction Isolation 1. prezygotic isolation – premating isolation (before) a. mating call not recognized b. mating times (frogs pg 329)

13 2. postzygotic isolation – postmating a. offspring may die b. offspring may not dev completely c. offspring may be infertile

14 III. Rates of Speciation A. gradualism – slowly B. punctuated equilibrium – rapid change in little periods

15

16 Overview of theory of evolution

17 Tortoise


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