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Lecture 9

NATS 1940 Lecture Notes - Lecture 9: Gene Pool, Population Genetics

Natural Science
Course Code
NATS 1940
Mark Vicari

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OCTOBER 3, 2017
Population Genetics
= the study of how the genetic makeup of populations changes through time
o explains evolution in Mendelian terms, i.e. at the level of genes and alleles
o the study of evolution at its smallest scale
o A group of individuals of the same species living in the same (arbitrary defined)
area. Members of a population are more likely to breed with each other than
with members of another population
Gene pool
o All the alleles of all the genes in all individuals of a population
Fixed allele:
o when all individuals in a population are homozygous for the same allele
can be expressed as fractions, decimals or percentages
What is the frequency of white moths in this moth population?
Two out of eight moths are white
Frequency = 2/8 = 1/4
= 0.25
= 25%
The frequency of an allele =
o (Number of copies of the allele) divided by (Total number of all copies of all
alleles for that gene)
Let p = frequency of the dominant allele
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