homework 1

homework 1 - Sametra Williams ANSC 4018 Homework #1...

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Sametra Williams ANSC 4018 Homework #1 September 18, 2008 1. (a) (b) The probabilities of all homozygous combinations are .25 . (c) The probabilities of all heterozygous combinations are .75 . 2. After mating a roan colored, Shorthorn bull to 48 colored, Shorthorn cows: (a) I would expect 24 roan calves, 12 red calves, and 12 white calves. (b) I would not expect all their coat colors to match my above expectations totally. My expected calculations are only an “on average” calculation. Genes and gene transfers cannot be exactly/ accurately calculated. In some instances, the environment can also play a large role in reproduction variation. All in all, the numbers/ ratios will fit “quite closely.” 3. A roan, homozygous polled bull is mated to a roan, horned cow: (a) The possible genotypes are RRPp, RrPp, and rrPp. The possible phenotypes would be red, polled (.25 proportion), roan, polled (.50 proportion), and white, polled (.25 proportion). 4.
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This note was uploaded on 02/03/2009 for the course ANSC 4018 taught by Professor Hay during the Spring '09 term at LSU.

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homework 1 - Sametra Williams ANSC 4018 Homework #1...

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