9. In fruit flies, the gene for tan body color (T) is completely dominant over the gene for ebony body color (t). The gene for red eyes is dominant over the gene for white eyes and is a sex-linked trait. A tan female with red eyes (heterozygous for both traits) is crossed with a homozygous ebony male with white eyes. A) Write out the genotypes of two parents. Remember that eye color is sex- linked! Female: Male: B) Set up and fill out a punnett square for this cross. C) What is the probability of producing a fly that is an ebony male with white eyes?

7) In cats, the gene for coat color is both X-linked and incompletely dominant. There are black coat and yellow coat alleles, with calico (tortoise shell) as the heterozygous form. If a yellow male mates with a calico female, what are the expected offspring phenotypes (in percent)? hbit

a. In mice, dark coat color is dominant over albino and short hair is dominant over long hair. Assume that these two traits are caused by two independently assorting genes. Hair color is determined by the (D/d) alleles. Hair length is caused by the (S/s) alleles. Two mice are crossed and result in the following progeny: 20 short-haired, dark mice and 21 short-haired, albino mice. What is the most likely genotype for the parents?   b. The researcher who is counting the mice suddenly realizes that the trait is probably X-linked as all the albino mice are one sex and all the dark mice are theoppositesex. What can you conclude about the 2 parental mice with regard to the hair color trait?

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