BGYB51H3 Lecture 8 and 9 Notes Oct 6

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Department
Biological Sciences
Course
BIOC51H3
Professor
Maydianne Andrade
Semester
Fall

Description
BGYB51H3 Lecture 8-9 Notes -natural selection reduces variation in populations because it removes unfavourable variance -mutation is essential for evolution to proceed and increase variation -two or more alleles for a gene causes a polymorphic gene -changes in the base sequence of DNA are called mutations -selection varies across a latitudinal gradient and indicates variation -variation can be measured through polymorphism and mean heterozygosity -point mutations generate new alleles through substituting bases -the fate of a new allele depends on its fitness effect -neutral alleles may be maintained, lost, or fixed by chance -mutations in non-coding regions of DNA cause neutral fitness -replacement substitutions may result in an amino acid with similar properties as the expected amino acid, therefore not affecting phenotype -accumulation of mutations tends to decrease fitness causing less survival to sexu
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