PLEASE SHOW ALL WORK In mice, three alleles for a single gene affecting coat col

Question

PLEASE SHOW ALL 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 x Aa

Phenotype of parents- Yellow x agouti

Expected proporions of offspring- AYA (yellow) , AYa(yellow), Aa (agouti), aa (black)

Yellow: Agouti : black= 2:1:1

b) AYa x AYa

Phenotype of parents- Yellow x Yellow

Expected proporions of offspring- AYAY (lethal) , AYa(yellow), AYa(yellow), aa (black)

Yellow: black= 2:1

c) AA x Aa

Phenotype of parents- Agouti x agouti

Expected proporions of offspring- AA (Agouti) , Aa(agouti), AA (Agouti), Aa (agouti)

All agouti offspring

d) AYA x  AYa

Phenotype of parents- Yellow x Yellow

Expected proporions of offspring- AYAY (lethal) , AYa(yellow), AYA (yellow), Aa (agouti)

Yellow: agouti= 2:1

e) AYA x AYA

Phenotype of parents- Yellow x Yellow

Expected proportions of offspring- AYAY(lethal) , AYA(yellow),AYA(yellow), AA(agouti)

Yellow: agouti= 2:1

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