Question

In four-o-clocks, pink flowers are the result of a red allele and a white allele for the color gene. The crossing of a white and pink flower produces

• A. 20 red and 20 pink
• B. 40 pink
• C. 20 pink and 20 white
• D. 20 red and 20 white
• E. 40 white

Answer 1

The correct option is C 20 pink and 20 white

Flower color in four o clock plant is an example of incomplete dominance wherein homozygous dominant (RR) gives "red" phenotype, heterozygous dominant (Rr) gives pink and homozygous recessive (rr) gives white phenotype. The genotype of parents is Rr (pink) and rr (white). The phonotypic ratio of progeny will be 1 pink: 1 white. Thus, the correct answer is option C.

gametes rr Rr	r
R	Rr (pink)
r	rr (white)