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Q.

What is the ratio of homozygous plants for both dominant characters in F2 of a dihybrid cross?

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a

3/16

b

1/16

c

4/16

d

9/16

answer is A.

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Detailed Solution

In a dihybrid cross, which is a cross between two heterozygous individuals for two different traits, the offspring can have four different allele combinations: two homozygous dominant, two heterozygous, and two homozygous recessives. 

Because 9 of the 16 possible combinations result in homozygous dominant plants, the ratio of homozygous dominant plants is 9 / 16.

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