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BIOC51H3 (51)
Lecture

Readings 8 notes

2 Pages
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Department
Biological Sciences
Course Code
BIOC51H3
Professor
Maydianne Andrade

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Readings 8
Pg223-228
-when an ideal population has no mutation, no migration and infinitely large size as well as
v}uu]vPUZooo(µv]}v[ZvPvZPv}Ç(µv]v
calculated
-migration is the movement of alleles between populations and depends on the mobility of
individuals
-migration from one population to another changes allele frequencies and can prevent fixation
-migration is a homogenizing evolutionary process in that it causes no heterozygosity
Pg 232-242
-the variation generated by mutation is random in the sense that when mutation substitutes
}vu]v}](}v}Z}]vU]}v[PÁZZ]uP}]u}ÀZ
protein function
-natural selection is not random
-genetic drift only leads to changes in allele frequency caused by chance
(refer to example on pg233)
-in a small population, chance events produce outcomes that differ from theoretical
expectations
-sampling error is the random discrepancy between theoretical expectations and actual results
-sampling error in the production of zygotes from a gene pool is genetic drift
-Pv]](v[}µ]}v
-selection is differential reproductive success that happens for a reason while genetic drift just
happens
-as sample size increases, sampling error decreases
-genetic drift is a powerful evolutionary mechanism in small populations but declines in larger
populations
-the founder effect is the allele frequencies in the new population being different from the
source population simply by chance
-the founding of a new population by a small group of individuals typically represents not only
the establishment of a new population but the evolution of differences between the new and
old population
(refer to pg240)
-because the fluctuations in allele frequencies from one generation to the next are caused by
random sampling error, every population follows a unique evolutionary path
-given sufficient time, genetic drift can produce substantial changes in allele frequencies even in
populations that are fairly large
-the wandering allele frequencies cause alleles to drift to fixation or loss and the frequency of
heterozygotes declines
-the frequency of heterozygotes in a population is sometimes called the popul]}v[
heterozygosity
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Description
Readings 8 Pg223-228 -when an ideal population has no mutation, no migration and infinitely large size as well as L}KK]L27ZoooL ]Z}L[ ZL2LZ2L}L ]Z L calculated -migration is the movement of alleles between populations and depends on the mobility of individuals -migration from one population to another changes allele frequencies and can prevent fixation -migration is a homogenizing evolutionary process in that it causes no heterozygosity Pg 232-242 -the variation generated by mutation is random in the sense that when mutation substitutes }LK]L} ]}L}Z}]L7]}ZL[2ZZ]K2Z}]K}ZZ protein function -natural selection is not random -genetic drift only leads to changes in allele frequency caused by chance (refer to example on pg233) -in a small population, chance events produce outcomes that differ from theoretical expectations -sampling error is the random discrepancy between theoretical expectations and actual results -sampling error in the production of zygotes from a gene pool is genetic drift -2L] ] L[} ]}L -selection is different
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