If round seed (RR) was dominant over wrinkled seed (rr) in a

if-round-seed-rr-was-dominant-over-wrinkled-seed-rr-in-a

If round seed (RR) was dominant over wrinkled seed (rr) in a monohybrid cross, and yellow pod (YY) was dominant over brown pod (yy), what should be the starting genotype of parents in a dihybrid cross?

A. RRrr and YYyy

B. RRYY and rryy

C. RRyy and YYrr

D. RrYy and RrYy

The question was posed to me during a job interview.

The above asked question is from Inheritance of Two Genes-1 in chapter Principles of Inheritance and Variation of Biology – Class 12

Right answer is B. RRYY and rryy

The explanation: The dihybrid cross is used to the inheritance pattern of two contrasting characters. Hence, they should be true-breeding. One for both dominant traits and the other for both recessive traits.