homework 2

homework 2 - Sametra Williams September 25, 2008 ANSC 4018...

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Sametra Williams September 25, 2008 ANSC 4018 Homework #2 4.2. Gene frequency is defined as the relative frequency of a particular allele in a population. Genotypic frequency is defined as the relative frequency of a particular one-locus genotype in a population. Calculation for gene frequency in a population for a simply-inherited trait affected by a single locus can be done by calculating the dominant homozygous genotype (p^2), the heterozygous genotype (2pq), and the recessive homozygous genotype (q^2); example: p^2+2pq+q^2. After finding the numbers at genotypes, more work has to be done. These further calculations can be done by multiplying the dominant homozygous by 2 (since it has 2 alleles at that locus) and then adding it to ½ of the total of the heterozygous allele, then dividing this amount by the total amount of individuals. This is the same for calculating q, except you take the calculations from the homozygous recessive instead of the dominant. Rule of thumb: the particular dominant homozygous allele (p) and the recessive homozygous allele (q) has to always
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homework 2 - Sametra Williams September 25, 2008 ANSC 4018...

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