Fruit flies normally have dull red eyes, but geneticists have identified quite a few genes which cause them to have different colored eyes. The very first of these discovered was a gene with a recessive allele for white eyes. This gene isXlinked.Xlinkage works the same in fruit flies as it does in mammals. We’ll use the symbolsW(dominant red eyes) andw(recessive white eyes) for these two alleles.
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