Genetics Picture

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An important word: Gene frequency

Using the gene for dilute color as an example, let us assume that we have a breed population of 100 cats. Since every cat has a double set of chromosomes, this population will have 200 loci for the dilution gene - meaning 200 places where the D or d gene can be situated. Now assume that 40 of these loci are filled with a d-gene, while the remaining 160 are filled with D-genes. Then the gene frequency for d in this population is 40/200 = 0.20 = 20%. In the same way we find that the gene frequency for D is 160/200 = 0.80 = 80%.