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Gene Pool
Objective 4
Evolution & Gene Pools

A single organism does not evolve


One animal has the genes it was born with
and they do not change
Populations evolve

Populations are multiple animals of a single
species
Genetic variation is studied in populations
 All the genes (and alleles) in a population
are called a gene pool

Gene Pool
What is the gene pool for
skin color in this
population of frogs?
 Gene Pool:

Green
 Purple
 Red

Relative Frequency



Relative Frequency is the
number of times each trait or
allele in a gene pool appears
relative to the total population
What are the Relative
Frequencies for the skin color
trait in this gene pool?
Relative Frequency:



Green 12/15
Purple 2/15
Red 1/15
Gene Pool: fur color in a
population of mice



What is the relative frequency of the brown and black hair
alleles?
Brown: 30/50
Black: 20/50
Sample Population
48%
heterozygous
black
16%
homozygous
black
36%
homozygous
brown
Frequency of Alleles
allele
allele
forfor
brown
brown
furfur
allelefor
for
allele
blackfur
fur
black
Darwin Awards
“Thanks for removing your genes from the
gene pool”
 http://darwinawardsdvd.com/
