In the fruit fly Drosophila, eye color is an X-linked trait, with the allele for red (R) dominant to the allele for white (r). Which of the following is true of a cross in which the P generation is a white-eyed female crossed with a red-eyed male. Feel free to use scratch paper.
Read DetailsTay-Sachs disease is a rare recessive autosomal disease. Jacob & Sarah are married and have a daughter. None of the three of them have the disease, but both Jacob’s mother and Sarah’s father did have the disease. What is the probability that the couple’s daughter is a carrier for Tay-Sachs (i.e. heterozygous at the T-S locus)? (Draw a pedigree on scratch paper if you wish, then select your answer from the choices below.)
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