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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?

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in Biology – Class 12 by (271k points)
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

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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.

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