from Freeman

1
from Freeman Herron Evolutionary Analysis
(2004)
2
from Freeman Herron Evolutionary Analysis
(2004)
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(No Transcript)
4
The Arizona pocket mouse Chaetodipus
intermedius has two color forms. Why?
picture by Hopi Hoekstra
5
Hopi E. Hoekstra, Kristen E. Drumm, and Michael
W. Nachman (2004) Ecological genetics of adaptive
color polymorphism in pocket mice geographic
variation in selected and neutral genes.
Evolution, 58 (6) 13291341
6
Hopi E. Hoekstra, Kristen E. Drumm, and Michael
W. Nachman (2004) Ecological genetics of adaptive
color polymorphism in pocket mice geographic
variation in selected and neutral genes.
Evolution, 58 (6) 13291341
7
Hopi E. Hoekstra, Kristen E. Drumm, and Michael
W. Nachman (2004) Ecological genetics of adaptive
color polymorphism in pocket mice geographic
variation in selected and neutral genes.
Evolution, 58 (6) 13291341
8
here is the model used by Hoekstra et al. to
determine strength of selection in their
populations of mice
9
what assumptions are they making here? (i.e.
what parameters are missing?)
10
(dark)
frequency of most common mtDNA allele
"p"
Hopi E. Hoekstra, Kristen E. Drumm, and Michael
W. Nachman (2004) Ecological genetics of adaptive
color polymorphism in pocket mice geographic
variation in selected and neutral genes.
Evolution, 58 (6) 13291341
11
Hopi E. Hoekstra, Kristen E. Drumm, and Michael
W. Nachman (2004) Ecological genetics of adaptive
color polymorphism in pocket mice geographic
variation in selected and neutral genes.
Evolution, 58 (6) 13291341
12
Hopi E. Hoekstra, Kristen E. Drumm, and Michael
W. Nachman (2004) Ecological genetics of adaptive
color polymorphism in pocket mice geographic
variation in selected and neutral genes.
Evolution, 58 (6) 13291341
13
Hopi E. Hoekstra, Kristen E. Drumm, and Michael
W. Nachman (2004) Ecological genetics of adaptive
color polymorphism in pocket mice geographic
variation in selected and neutral genes.
Evolution, 58 (6) 13291341
14
(No Transcript)
15
Genetic Drift
evolutionary change resulting from chance
events, rather than, say, selection
one of the major possible explanations to
account for populations not in Hardy-Weinberg-Cast
le equilibrium
the smaller the population size, the more drift
should be a factor in determining the allele
frequencies of that population (note that the key
value is not total population size, but
"effective population size" Ne, as this latter
value only considers the breeding members of a
population)
evolutionary change dominated by drift is
predicted to be accompanied by a loss of genetic
(allelic) diversity and decreased heterozygosity
drift is the predominant mechanism underlying the
so-called "founder effect"
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the "founder effect" in the silvereye, Zosterops
lateralis
from Freeman Herron Evolutionary Analysis
(2004)
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simulations of changes in populations due to
drift, and the importance of population size
from Freeman Herron Evolutionary Analysis
(2004)
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the relationship between population size and two
measures of genetic diversity in wild
populations of plants
from Freeman Herron Evolutionary Analysis
(2004)
19
this is the actual data from Buri's classic
experiment on drift in small D. melanogaster
populations (as described on pages 214-217 in
your book)
Buri, P. 1956. Gene frequency in small
populations of mutant Drosophila. Evolution10
367-402.