Tue February 22, 2011 By: Kanudha Gupta

how to draw a dihybrid cross?

Expert Reply
Wed February 23, 2011
Dear student,
You need to first write the genotype of both parents, followed by the gametes produced by each parent. Next write the genotype of the offsprings produced in F1 generation. Then the offsprings in F1 are crossed. For this all possible gametes produced by each parent are written and then we see the outcome of each possible cross. This is done using a Punnet square.
The following example will make it clear.
A pea plant with round yellow (RRYY) seeds is crossed with another pea plant having green wrinkled (yyrr) seeds.
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