increased homozygosity
increased homozygosity
increased homozygosity
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An unusual case…<br />
Inbreeding can potentially purge deleterious recessive<br />
alleles from a population (none hiding in heterozygotes)<br />
e.g, Chillingham wild cattle (N300 years of total inbreeding<br />
Complete <strong>homozygosity</strong> at<br />
24 of 25 loci examined<br />
(Other cattle:>70%<br />
heterozygous at the same<br />
loci)<br />
No drop in viability or<br />
fecundity relative to other<br />
cattle.<br />
Sexual Selection<br />
• Viability: probability of survival to reproductive age<br />
• Mating Success<br />
Sexual selection: differential reproductive success<br />
due to differential mating success<br />
• Fecundity: viable offspring<br />
Bright coloration: favored for mating<br />
success — attracts females<br />
Dull coloration: favored for protection from<br />
predators<br />
Guppy (Poecilia sp.)<br />
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