Genes R and Y follow independent assortment. If RRYY produce round yellow seeds and rryy produce wrinkled green seeds, what will be the phenotypic ratio of the F2 generation?

Question

With the help of the given pedigree, find out the probability for the birth of a child having no disease and being a carrier (has the disease mutation in one allele of the gene) in the F3 generation.

Answer 1

This represents a standard dihybrid cross. When two genes assort independently, each with dominant/recessive alleles (R/r and Y/y), the F2 generation exhibits a phenotypic ratio of 9:3:3:1: 9: Round, Yellow (R\_Y\_)
3: Round, Green (R\_yy)
3: Wrinkled, Yellow (rrY\_)
1: Wrinkled, Green (rryy)

List-I	List-II
A. Metacentric chromosome	I. Chromosome has a terminal centromere
B. Sub-metacentric chromosome	II. Middle centromere forming two equal arms of chromosome
C. Acrocentric chromosome	III. Centromere is slightly away from the middle of chromosome resulting into two unequal arms
D. Telocentric chromosome	IV. Centromere is situated close to its end forming one extremely short and one very long arm

Genes R and Y follow independent assortment. If RRYY produce round yellow seeds and rryy produce wrinkled green seeds, what will be the phenotypic ratio of the F2 generation?

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The Correct Option is B

Solution and Explanation

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