BSC 196 Lecture 5: Bio-Lecture 5

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8 Feb 2017
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Wednesday, February 8, 2017
1
Mutations
Variation
- Variation in heritable traits is a prerequisite for evolution
- Sources of Phenotypic Variation
genetic: differences in genes
environment
- Natural selection can only act on variation with a genetic component
Sources of Genetic Variation
- mutation
leads to creation of new alleles and new genes
- sexual reproduction
creates genetic variation by producing novel combinations of existing alleles
Origin of Genetic Variation
- mutation: mistake made during DNA copying
origin of variation and mechanism of change (i.e., evolution)
- point - source of new alleles
- chromosomal - source of new genes, species
- point mutation: change in one of the nucleotide bases
Point Mutation
- direction of transcription
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