Chapter_23_Learning_Objectives - Chapter Learning...

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Chapter Learning Objectives Chapter 23: The Evolution of Populations Explain the statement “It is the population, not the individual that evolves.” a. Look at 22 Convergent evolution – different ancestors living in similar environments (a lot of analogous) Divergent evolution – when one species branches to form 2 or more species Concept 23.1: Mutation and sexual recombination produce the genetic variation that makes evolution possible - Mutation = create new alleles therefore variability o Point mutation = change in one of the nitrogenous bases in the gene (A instead of a G) o Chromosomal mutation = delete disrupt or rearrange (a lot of stuff messed up…at least) o Gene duplication = duplication of whole segments of the chromosome - Sexual recombination = in sexually reproducing organisms, produces most of the variability in each generation Compare discrete and quantitative characters a. Discrete = either or basis i. Flower color either pink or white b. Quantitative = vary along a continuum i. One extreme to another and some in between, HEIGHT ! Describe the significance of mutation in the generation of genetic variability. a. Without mutation, there would be no variability Explain how sexual recombination generates genetic variability. a. Blonde hair, blue eyes etc.
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This note was uploaded on 02/26/2009 for the course BIOL 1202 taught by Professor Gregg during the Spring '08 term at LSU.

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Chapter_23_Learning_Objectives - Chapter Learning...

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