Question

The ratio of the kinds of genotypes formed in the largest phenotypic group of $F_2$ progeny of dihybrid cross ________

• A. $1:2:4:2$
• B. $2:1:4:2$
• C. $1:2:2:4$
• D. $1:1:1:4$

Answer 1

The correct option is C $1:2:2:4$

The most frequent phenotype in F2 dihybrid cross has a value of 9/16. Among these 9 offspring, the ratio of the genotypes YYRR:YyRR:YYRr:YyRr is 1:2:2:4. All these genotypes add on to the same phenotype but they are individually different.

So the correct option is'1:2:2:4'.