Population Genetics
Gene Pool:
Individual has genotype: such as AA, Aa, or aa
individual genotype |
alleles |
A |
a |
AA |
2 |
0 |
Aa |
1 |
1 |
aa |
0 |
2 |
"population" is all individuals
. . -of the same species
. . -living in a defined geographic area
. . -and "interacting with one another.
population has gene pool:
|
|
alleles |
genotype |
number |
A |
a |
AA |
49 |
98 |
0 |
Aa |
42 |
42 |
42 |
aa |
9 |
0 |
18 |
subtotal |
- |
140 |
60 |
total |
100 |
200 |
p |
|
0.70 |
|
q |
|
|
0.30 |
p is the frequency of the 'A' allele in the population
q is the frequency of the 'a' allele in the population
p + q = 1.00
. . -allele frequency is independent of
Mendelian dominance
Populations (or sub-populations) can be compared by their gene pools
adaptation is reflected in gene pools differences
. . -when populations are in different
environments
. . -hypothetically: knowing population response
to environment
. . . may allow predicting response to
environmental change
. . . -a) predict effect of deliberate or
inadvertent environmental change
. . . -b) predict environmental change needed to
reverse adverse effect on population
RETURN TO OUTLINE
© 2004 Prof. LaFrance, Ancilla College