Alleles - Open Access .click

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Annual Review of Genomics and Human Genetics, 2000
The age of an allele can be estimated both from genetic variation among different copies (intra-allelic variation) and from its frequency. Estimates based on intra-allelic variation follow from the exponential decay of linkage disequilibrium because of recombination and mutation.
Montgomery Slatkin, Bruce Rannala
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On the Genealogy of a Rare Allele

Theoretical Population Biology, 1997
The gene genealogy is derived for a rare allele that is descended from a mutant ancestor that arose at a fixed time in the past. Following Thompson (1976, Amer. J. Human Genet. 28, 442-452), the fractional linear branching process is used as a model of the demography of a rare allele.
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Segregation of alleles

1981
You probably already know about segregation of alleles and assortment of non-alleles (the topics of this chapter and the next) from an undergraduate course in general genetics. I assume that you also know about the behaviour of chromosomes during mitosis, meiosis and fertilisation and that you know genes are carried on chromosomes.
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Resistance to HIV-1 infection in Caucasian individuals bearing mutant alleles of the CCR-5 chemokine receptor gene