Aplant that has round and yellow seeds (rryy) is crossed with a plant that has round and yellow seeds (rryy). what is the ratio of the offspring that will have round and yellow seeds?

key: r = round
r = wrinkled
y = yellow
y = green
1: 16
3: 16
8: 16
9: 16

The correct answer is- 9:16.

In the given question, genotypes of the parents are-

RrYy and RrYy, which shows heterozygous ( having two different alleles such as 'R' and 'r', 'Y' and 'y') dominant genotype for the shape and color of the seeds. A dominant allele ( shown with capital letter) masks the expression of a recessive allele ( that is presented with small letter).

Both the parents will produce same gametes, which are-

RY, Ry, rY, and ry.

When they are allowed to cross, they will produce offspring with 16 different  genotypes ( corresponding to 4 different phenotypes that are round yellow, round green, wrinkled yellow, and wrinkled green).

The ratio of the offspring that will have round and yellow seeds is 9: 16.

Refer punnett square.

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