PLEASE SHOW WORK In mice, three alleles for a single gene affecting coat color h

Question

PLEASE SHOW WORK

In mice, three alleles for a single gene affecting coat color have the following relationships: A^Y > A > a There are four possible phenotypes which are associated with the following genotypes: yellow coat - A^A or AYa lethal (mice die in utero) - A^YA^Y agouti (gray) - AA or Aa black - aa For the following crosses indicate the phenotypes of the parents and the expected proportions of possible offspring: a) A^Y a times Aa b) A^Y a times A^Y a c) AA times Aa d) A^Y A times A^Y a e) A^Y A times A^Y A

Explanation / Answer

a. Aya × Aa

Yellow coat × agouti

Offsprings obtained would have following genotypes-

25 % AyA yellow coat), 25% Aa (agouti), 25% Aya, 25% aa- black

b. Aya × Aya

Yellow coat × yellow coat

Offsprings obtained would have following genotypes-

25% Ay Ay(lethal, 25% Ay a(yellow coat), 25% Aya(yellow coat) , 25% aa black.

c. AA × Aa

Agouti × agouti

Offsprings obtained would have following genotypes-

50% AA (agouti), 50% Aa(agouti)

d. AyA  × Aya

yellow coat  × yellow coat

Offsprings obtained would have following genotypes-

25% Ay Ay (lethal), 25% Ay A (yellow coat),25% Aya(yellow coat), 25% Aa(agouti)

e. AYA × AyA

Offsprings obtained would have following genotypes-

25% AyAy(lethal), 50% AYA( yellow coat), 25% AA(agouti)

  

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