Question

A cross between a plant with red flowers (R = dominant) and a plant with white flowers (are = recessive) yielded 47 plants with red flowers and 51 plants with white flowers. What are the genotypes of the parent plants

Answer 1

Red parent: Rr

White parent: rr

Step-by-step explanation:

Number of red flower plants yielded = 47

Number of white flower plants yielded = 50

Ratio of red to white flower = 1:1 approximately

Let us assume that the genotype of the red parent is heterozygote (Rr), since the white allele is recessive, the genotype of the white parent is definitely rr.

Rr x rr = Rr (red), Rr (red), rr (white), rr (white)

Ratio of red offspring to white offspring = 1:1

Hence, the genotype of the red parent is Rr while that of white parent is rr.