Adihybrid cross is created from plants that are heterozygous for both round seeds and yellow seed color. what is the ratio of offspring that have round seeds and yellow seed color?
1: 16
3: 16
9: 16
16: 16

The correct answer is-

9:16

As per the information in the question, parent plants are heterozygous for both round seeds and yellow seed color (which means they contain different allele for both traits).

Dominant trait ( depicted by capital letter allele such as R and Y here) masks the expression of a recessive trait ( that is depicted by small letter allele such as r and y).

The genotypes of parent plants are- RrYy and RrYy ( indicating round and yellow are dominant trait as they are expressed in the heterozygous state.)

Both plants will produce 4 types of Gametes - RY, Ry, rY, ry

When these plants are crossed, they will produce round yellow seeds in the ratio 9: 16 ( that is out of 16 offspring, 9 are produced with round yellow seeds)

Refer punnet square.

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