Question

How many types of genotypes are formed in F${}_2$ progeny obtained from self polination of a dihybrid F${}_1$?

• A. 9
• B. 3
• C. 6
• D. 1

Answer 1

The correct option is A 9

The cross can be represented as shown in the figure.

Hence the types of genotypes formed are RRYY, RrYY, RRYy, RrYy, rrYY, rrYy, RRyy, Rryy, rryy in the ratio of 1: 2: 2: 4: 1: 2: 1: 2: 1

So, 9 types of genotypes are formed. So, the correct answer is '9'.