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The P and Q genes of a plant are 20 m.u. apart. A PP QQ and...

The P and Q genes of a plant are 20 m.u. apart. A PP QQ and a pp qq individual cross, and the F1 cross with each other to produce the F2. The P and p, and Q and q alleles are completely dominant and recessive, and there are no interactions between genes P and Q. What phenotypic ratio would you expect in the F2?

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Answer #1

parents PPQQ * ppqq

gametes PQ pq

F1 generation PpQq

PQ Pq pQ pq
PQ PPQQ PPQq PpQQ PpQq
Pq PPQq PPpq PpQq Ppqq
pQ PpQQ PpQq ppQQ ppQq
pq PpQq Ppqq ppQq ppqq

phenotypic ratio 9:3:3:1

if there is no internation between P and Q then ratio become 12:3:1

  

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