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Q.

What will be the F2 phenotypical ratio of mendelian dihybrid cross if one pair of traits for dominance and another pair of traits for incomplete dominance are considered?

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a

3 : 6 :3 : 1: 2 : 1

b

9 : 3 : 3 : 1

c

1 : 6 : 15 : 20 : 15 : 6 : 1

d

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

answer is B.

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Detailed Solution

Phenotypic ratio of monohybrid crosses is when dominance and recessive relationships are applicable. 

 = 3 : 1
Incomplete dominance, dominance and recessive relationship are not applicable, thus its phenotypic ratio is = 1: 2 : 1

When a dihybrid cross involves one pair with dominance and recessive relationship and another pair with incomplete dominance, the resultant phenotypic ratio would be 
(3 : 1) multiplied with  (1: 2: 1) = 3 : 6 : 3 : 1 : 2 : 1

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What will be the F2 phenotypical ratio of mendelian dihybrid cross if one pair of traits for dominance and another pair of traits for incomplete dominance are considered?