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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.
 Spring '09
 HAY

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