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chance effects
random genetic drift
•
populations are not infinitely large
•
reproduction is a probabalistic process
–
the number of offspring is different by chance
–
genes in one generation are represented by a
chance number of copies of the gene in the next
•
Stochastic
changes
in
populations
random genetic drift
simple model  assumptions
•
monoecious diploid organisms
–
allows for selffertilization
•
sexual reproduction
random genetic drift
simple model  assumptions
•
nonoverlapping generations
•
no mutation
•
no selection
random genetic drift
simple model  assumptions
some genes represented more
some genes represented less
some represented as same number
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View Full Document random genetic drift
simple model  assumptions
•
rate of genetic drift depends on the size of
the population  2N
–
genetic drift faster when N is smaller
Hartl & Clark, 1989
simulation results
Hartl & Clark, 1989
random genetic drift
simple model  assumptions
•
Many independent subpopulations
–
each of constant size N
–
random mating within each subpopulation
initial base population
 infinite size
initial base population
 infinite size
GAMETES
2N
2N
2N
2N
2N
0
GEN
N
N
N
N
N
BREEDING
ADULTS
initial base population
 infinite size
GAMETES
2N
2N
2N
2N
2N
0
GEN
BREEDING
ADULTS
GAMETES
2N
2N
2N
2N
2N
1
N
N
N
N
N
initial base population
 infinite size
GAMETES
2N
2N
2N
2N
2N
0
GEN
GEN
N
N
N
N
N
BREEDING
ADULTS
GEN
2
BREEDING
ADULTS
GAMETES
2N
2N
2N
2N
2N
1
N
N
N
N
N
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This note was uploaded on 07/17/2008 for the course EEOB 640 taught by Professor Fuerst during the Spring '05 term at Ohio State.
 Spring '05
 FUERST

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