ANTH 1001 Notes 1-29

ANTH 1001 Notes 1-29 - ANTH 1001 1-29 Codon triplet of...

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ANTH 1001 1-29 Codon- triplet of DNA/RNA Dominant allele vs. recessive= frequency in population provides no information about the relative natural selection In the case of a harmful trait, the dominant allele will be more risky since the trait will be present in both homo and heterozygous situations; recessive is fine because only 1 of the 3 combinations are active harm. MUTATION -absolutely necessary for evolution of species b/c it provides variation I. Mutation & Evolution A. Def.- Evolution- a change in allele frequencies over time; a group evolves, not an individual B. Mutation- the only way of introducing new alleles into a species Most mutations are either harmful or neutral to an organism, but the advantage or disadvantage is relative to environmental circumstances. Ex/ Fruit fly can’t fly= disadvantage; Fruit fly can’t get swept to sea by winds=advantage Mutation provides genetic variation upon which natural selection can act. The increase in frequency of a new/mutant allele in a population/species is by natural selection.
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