First slide

Inheritance of Two Genes

Question

Calculate the percentage of recombinants in the F₂ generation in a typical Mendelian dihybrid cross.

Moderate

A

62.5%
B

37.5%
C

56.25%
D

6.25%

Solution

The phenotypic ratio in a typical Mendelian dihybrid cross is 9:3:3:1 where 3:3 is the ratio of the recombinants. Therefore, the percentage of recombinant is $\frac{3 + 3}{9 + 3 + 3 + 1} = \frac{6}{16} = 37.5 %$ .

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