First slide

Inheritance of Two Genes

Question

What percentage of offspring would have genotype RrYy if parents are having genotypes RrYy and RrYy?

Moderate

A

12.5
B

50
C

25
D

6.25

Solution

If cross is made between Rr Yy and Rr Yy parents the the genotypic ratio or RRYY (1) : RrYY (2) : RRYy (2) : RrYy (4) : RRyy (1) : Rryy (2) : rrYY (1) : rrYy (2) : rryy (1). Since RrYy individuals are 4 and the percentage of RrYy offspring would be 4/16 X 100 = 25%.

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