In cats, the dominant white gene (W) may or may not also cause deafness. Homozygotes are more likely to be deaf than heterozygotes
If you breed heterozygous white cats together and produce 100 kittens, how many would you expect to be deaf if all the proportions came out perfectly? Assume that heterozygotes have an 8% chance of being deaf, and homozygotes a 60% chance of being deaf.
Homozygotes should be of 100, which is 25. 60% of 25 = 15. Heterozygotes should be of 100, which is 50. 8% of 50 = 4. Expected deaf kittens would therefore be 15 + 4, or 19 kittens.
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