In chickens, feather colour and prescence or absence of a crest on the head are

Question

In chickens, feather colour and prescence or absence of a crest on the head are determined by two different genes located on different chromosomes. In answering the following questions use the letters D and d for feather color and Q and q for the crest presence/ absence. Rodney Red, a red rooster with no crest, met and courted Betty Black, a black, crested hen. All of their children had back feather and crests.

a.) give the genotypes of the following:

Rodney Red________

Betty Black ________

Their children (the F1) ________ .

Crestless Clarence, a neighbour, was heterozygous for feather colour and had no crest.

b. what is crestless Clarence's genotype?

c. Give the genotypes of all the gametes Crestless Clarence could produce.

d. Crestless Clarence married one of Rodney Red and Betty Black's daughters. Draw a Punette square to illustrate this cross.

e Calculate the expected phenotypic frequencies among the offspring of this cross (from part "d").

Explanation / Answer

Answer a. Black feather and crest are dominant traits as F1 was 100% black-feathered and crested.

Now,

Rodney Red, a red rooster with no crest = ddqq

Betty Black, a black, crested hen = DDQQ

The genotypes of the children (F1) when all were with black fearhers and crest = DdQq

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