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Mendel's Law of Inheritance

In a typical ...

Question

In a typical Mendelian cross which is a dihybrid cross, one parent is homozygous for both dominant traits and another parent is homozygous for both recessive traits. In the F $_{2}$ generation, both parental combinations and recombinations appear. The phenotypic ratio of parental combinations to recombinations is

A

10 : 6

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B

12 : 4

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C

9 : 7

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D

15 : 1

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Solution

The correct option is B 10 : 6
Homozygous dominant parent: RRYY
Homozygous recessive parent: rryy
F $_{1}$ generation: RrYy
Selfing of F $_{1}$ (RrYy X RrYy)
From the Punnet square, it is clear that, the phenotypic ratio of parental combinations to recombinations is 10:6.

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