Question

The ratio of 1:1:1:1 is obtained from a cross between the parents is ______.

• A. RRYY $\times$ rryy
• B. RRYy $\times$ rrYy
• C. RrYY $\times$ Rryy
• D. RrYy $\times$ rryy
• E. rrYy $\times$ rrYy

Answer 1

Answer: (D)

RrYy $\times$ rryy

In the given option D it is showing a test cross as it the given genotype RrYy is crossed with recessive parent rryy, the dihybrid ratio will be 1:1:1:1. while in options A, B, C & E such ratio will not be obtained.

So, the correct answer is "RrYy ×× rryy".