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Lecture 2

BIO week 2-LEC 4

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Department
Biology
Course
BIOL 1070
Professor
Wright& Newmaster
Semester
Fall

Description
Wednesday September 21, 2011 BIO week 2- LEC 4 NATURAL SELECTION  Evolution through natural selection happens in thousands and thousands of years  Population doesn’t evolve if the allele frequencies does not change from one generation to the next  Components of evolution by natural selection: Heritability, overproduction  Evolution involves a change in the proportion of variants (alleles) in a population  Mutations are RANDOM  Evolution can only occur if there is variation in a population  Mutations (errors in DNA replication) are the primary source of new variation  Good, bad and neutral mutations happen with equal probability  Beneficial Mutations increase in frequency and delete
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