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Lecture 12
N/A
10
Biology
Undergraduate 4
07/24/2014

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Term
Allozyme gel
Definition
Shows lots of protein variation. Heterozygous if there are two bands
Term
The molecular clock
Definition
comparisons of hemoglobin across numerous taxa indicated rate of substitution was pretty constant across different lineages
Term
The neutral theory
Definition
most polymorphism and most substitutions are neutral
Term
Probability that a newly arising neutral allele goes to fixation
Definition
1/(2 N)
Term
Synonymous (silent) substitutions
Definition
A change in the DNA sequence that does not alter the amino acid encoded (due to degeneracy of code)
Term
Non-synonymous (replacement) substitutions:
Definition
A change in the DNA sequence that does alter the amino acid encoded
Term
Polymorphism within taxa
Definition
more polymorphisms in small populations
Term
The neutral theory problems
Definition
Polymorphism levels are too low
Molecular clock ticks on a per year, not a per generation time scale
Variation across lineages in substitution rate is greater than predicted
Term
Symmetric overdominant selection
Definition
Fitness is as follows:
B0B0 1 - s
B0B1 1
B1B1 1 - s
Term
polymorphism
Definition
Tremendous amount of protein variation
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