Introduction to Genetic Analysis 633

Introduction to Genetic Analysis 633 - 44200_19_p611-642...

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genotype has some relative probability of survival. This general calculation is shown in Box 19-5. After one gen- eration of selection, the new value of the frequency of A is equal to the old value ( p ) multiplied by the ratio of the mean Ftness of A alleles, , to the mean Ftness of the whole population, . If the Ftness of A alleles is W W A greater than the average Ftness of all alleles, then is greater than unity and p 9 is larger than p. Thus, the al- lele A increases in the population. Conversely, if is less than unity, A decreases. But the mean Ftness of the population ( ) is the average Ftness of the A alleles and of the a alleles. So if is greater than the mean Ftness W A W W A / W W A / W 632 Chapter 19 Population Genetics The Effect of Selection on Allele Frequencies BOX 19-5 Suppose that a population is mating at random with respect to a given locus with two alleles and that the population is so large that (for the moment) we can ignore inbreeding. Just after the eggs have been fertil-
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This note was uploaded on 01/10/2011 for the course BIOL BIOL taught by Professor Johnson during the Spring '08 term at Aberystwyth University.

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