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HW5 key - Biology 202 Fall 2007 Homework 5 Due September 27...

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Biology 202 NAME: Fall 2007 T.A.: Homework 5 Discussion Section #: Due: September 27 or 28 1. (3 pts) In cattle, the polled (hornless) condition is dominant over the horned phenotype. A particular polled bull is bred to three cows. Cow A, which is horned, produces a horned calf; polled cow B produces a horned calf; and horned cow C produces a polled calf. What are the genotypes of the bull and the three cows, and what phenotypic ratios do you expect in the offspring of these three matings? Bull – Pp Cow A – pp Expect 1 polled : 1 horned Cow B – Pp Expect 3 polled : 1 horned Cow C – pp Expect 1 polled : 1 horned 2. (2 pts) Gray seed color ( G ) in garden peas is dominant to white seed color ( g ). In the following crosses, the indicated parents with known phenotypes but unknown genotypes produced the listed progeny. Give the possible genotype(s) of each female parent based on the data. Parents Progeny Female Parent Female X Male Gray White Genotype(s) grey X white 81 82 Gg gray X gray 118 39 Gg gray X white 74 0 GG gray X grey 90 0
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