Single Choice

On crossing red and white flowered plants the ratio of red and white flowered plants in F$$_2$$ generation was 60 : 20, then on selfing the heterozygous red flowered plants, the offsprings would be

A72 : 24
Correct Answer
B40 : 60
C52 : 48
D84 : 16

Solution

Since the F$$_2$$ generation ratio of red and white colour flower is 60:20 (3:1), the allele for red flower is completely dominant over that of white colour flower. If the red flower allele is denoted by R and that of white colour is denoted by r, the genotype of heterozygous red flowered plant will be Rr. This heterozygous red flowered plant will produce two types of gametes R and r. Selfing of heterozygous red flowered plants produce red and white colour flowers in 3:1 ratio. Option A (72:24) also show the same ratio. Hence, the correct option is A.
Gametes :
Rr --->
Rr R r
R RR
red Rr
red
r Rr
red rr
white

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