The Y allele in Drosophila is a dominant for yellow body color and the y allele is recessive for brown body color. The Y allele is also a recessive lethal allele. At a second locus, the allele B for long bristles is incompletely dominant to the allele b for short bristles. Follow the steps below to predict the genotypes and phenotypes of the LIVE progeny from the following cross: yellow body, medium bristled X yellow body, medium bristled. 1) What is the cross? 2) Break this down to the single gene level by answering the following questions: a. What is the ratio of yellow to brown offspring? Show the Punnett square, but include only the live offspring in the final ratios, and place a box around this final ratio: b. What is the ratio of bristle lengths? Show the Punnett square:

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