Question

If selfing occurs in the plant having genotype RrYy, then ratio of given genotype RRYY, RrYY, RRYy, RrYy, will be

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

Answer 1

The correct option is A 1 : 2 : 2 : 4

Selfing of RrYy : RrYy x RrYy
RY, Ry, rY and ry RY, Ry, rY and ry
Offspring : RRYY, RRYy, RrYY, RrYy, RRYy, RRyy, RrYy, Rryy, RrYY, RrYy, rrYY, rrYy, RrYy, Rryy, rrYy and rryy
The ratio of RRYY, RrYY, RRYy, RrYy is 1 : 2 : 2 : 4.