Question

Plump chicken body size (P) is dominant to skinny chicken body size (p). Aggressive behavior (A)...

Plump chicken body size (P) is dominant to skinny chicken body size (p). Aggressive behavior (A) is dominant to docile behavior (a). A male rooster is mated with a female chicken, and both parents are heterozygous for both traits (i.e. both are dihybrid). What are expected genotypic and phenotypic ratios among their offspring?

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Answer #1

Genotype of parent Rooster and chicken

PpAa×PpAa(both heterozygous)

Offsprings produced

Genotype PA Pa pA pa
PA PPAA PPAa PpAA PpAa
Pa PPAa PPaa PpAa Ppaa
pA PpAA PpAa ppAA ppAa
pa PpAa Ppaa ppAa ppaa

So the genotypic ratio will be

PPAA:PPAa:PPaa:PpAA:ppAa:Ppaa:ppAA:ppAa:ppaa

1:2:1:2:4:2:1:2:1

And the phenotypic ratio would be

Plump agressive: plump docile: skinny aggressive: skinny docile

9:3:3:1.

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