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Lecture 16

Lecture 16 Notes

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Department
Biology
Course
BIO120H1
Professor
Doug Thomson
Semester
Fall

Description
BIO120 LECTURE 16: MEASURING GENETIC DIVERSITY Fisher & Haldane: quantitative aspects of evolutionary change; population genetics into evolution Wright: mendelian law, natural selection, and continuous variation mathematical Synthesis of ecology (Darwinian natural selection and genetics) Theory of impericism. Not all genes are variable What forces influence diversity? Mutation Recombination Random genetic drift ( small population size effects) o Can lead to reduction in diversity Natural selection o Purifying ( negative) reduce fitness removed by selection o Positive selection (adaptation) mutatuion arises and is favoured. o Balancing selection heterozygotes are favoured over homozygotes Fisher felt that all important evolution occurred in large population by natural selection; genetic drift= unimportatn Wright genetic drift played important role in evolution ^CONTROVERSY IN EVOLUTIONARY BELIEFS Importance of mechanism: Mutation-selection balance Mutation and strength of selection Natural selection taking mutatuions out Differet selective forces www.notesolution.com
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