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Question: *Help with GENETICS HW Questions* 1. Holstein cattle dairy cows are normally black and white. A f…

*Help with GENETICS HW Questions*

1. Holstein cattle dairy cows are normally black and white. A
farmer purchased a superb black and white bull he named Charlie for
$100,000. (Note that the goal of the farmer’s breeding program is
to obtain ALL black and white progeny as these cows phenotypes are
the best milk producers). All the progeny sired by Charlie with
Holstein black and white pure bred female cows from the farm were
normal in appearance (= all black and white). However, certain
pairs of this progeny, when interbred, produced red and white
progeny in the subsequent generation (Charlie’s grandkids) at a
frequency of about 1/4. Charlie was soon removed from the stud
lists of the Holstein breeders.

a. Explain why:

b. What is the trait studied?

c. How many genes control this trait?

d. How many alleles are involved (use symbols to describe the
effect of these alleles)?

e. What is the allelic relationship?

f. Diagram the cross between pure-bred/true breeding black and
white Holstein female and Charlie the bull, indicating their
resulting progeny, and subsequent cross that gave the problematic
progeny (issue from interbreeding some of Charlie’s progeny)
containing 25% red and white cows amongst black and white cows.

g. For each generation, indicate phenotypes (and phenotypic
ratios) and genotypes for EACH cow involved.

h. What the farmer’s decision hasty?

i. Why did Charlie have to go and no longer be a stud for this
black and white Holstein breed?

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