First slide

Inheritance of Two Genes

Question

What is the probability of getting double homozygous recombinants in the F₂ generation of a Mendelian dihybrid cross?

Easy

A

4/16
B

2/16
C

9/16
D

12/16

Solution

If a cross was made between a plant having round and yellow seed plant with another plant having wrinkled, green seeded then the F₂ generation shows the phenotypic ratio as 9:3:3:1 . The genotypic ratio is 1: 2 : 2 : 4 : 1 : 2 : 1 : 2 : 1. In this 2/16 of the plants will have homozygous recombinants (rrYY and RRyy). Therefore, the ratio will be 2/16.

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