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Lecture 9

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


Department
Natural Science
Course Code
NATS 1940
Professor
Mark Vicari
Lecture
9

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BIODIVERSITY
OCTOBER 3, 2017
CHAPTER POPULATION GENETICS
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
Definitions
Population
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
Frequencies
=proportions
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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