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firstex - NAME ANS 3384 EXAM 1(10 pts 1 You have a grulla...

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NAME __________________________ ANS 3384 EXAM 1 FEBRUARY 11, 2009 (10 pts) 1. You have a grulla mare whose sire was black and she (the grulla mare) is known to be E/e, what are the possible colorations and their probability if she were to be bred to a dun (bay + D) that is heterozygous at the A, E and D loci? Note: to reduce the combinations combine E/E and E/e as well as D/D and D/d as the effect on the phenotype does not differ. (8 pts) 2. The following mating between a crossbred bull and a crossbred cow of the genotypes shown is made: The bull is of genotype (E D / E + S + /s) (Show work on back of this page) What are the coloration and spotting patterns of the: Bull: Cow: a. Will any calves be brindle and spotted like Holsteins? If so, what proportion? b. What proportion of the calves will look exactly like Herefords in spotting but be black in coloration? c. What proportion of the calves will be wild- type (“brown” but not brindle) and non-spotted?
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(8 pts) 3. A blue merle Collie (tri-color + merling) with short hair (smooth but heterozygous for the rough=long coat) is mated to a rough-coated sable whose dam was a tri- color. The sable is not a merle. Both dogs are si /si so all puppies will also be.
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