Question

You are studying two genes that both show codominant allelic interactions. What are the phenotypic ratios...

You are studying two genes that both show codominant allelic interactions. What are the phenotypic ratios you expect from the following cross: Aa:Bb x Aa:Bb? A and B are independent.

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Answer #1

Answe:

Phenotypic ratio = 1:2:1:2:4:2:1:2:1

Explanation:

Aa : Bb x Aa : Bb –Parents

AB

Ab

aB

ab

AB

AA:BB

AA:Bb

Aa:BB

Aa:Bb

Ab

AA:Bb

AA:bb

Aa:Bb

Aa:bb

aB

Aa:BB

Aa:Bb

aa:BB

aa:Bb

ab

Aa:Bb

Aa:bb

aa:Bb

aa : bb

Phenotype 1 = AA : BB = 1

Phenotype 2 = Aa: BB = 2

Phenotype 3 = AA:bb=1

Phenotype 4 = AA:Bb = 2

Phenotype 5 = Aa:Bb = 4

Phenotype 6 = Aa:bb = 2

Phenotype 7 = aa:BB = 1

Phenotype 8 = aa:Bb = 2

Phenotype 9 = aa : bb = 1

Phenotypic ratio = 1:2:1:2:4:2:1:2:1

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