question_answer

In sweet pea, C and P genes are essential for flower colour. In absence of either or both the genes, the flowers are white. What will be the percentage of coloured flowers in the off spring of cross\[Ccpp\times ccPp\]?

A)  75%                      

B)  25%   

C)  80%                      

D)  50%

Correct Answer: B

Solution :

                The mentioned cross in the question is a dihybrid. \[Ccpp\times ccPp\] (both are white) Hence, ratio of coloured to white flowers is 1:3,

	\[Cp\]	\[cp\]
\[cP\]	\[CcPp\](coloured)	\[ccPp\](white)
\[cp\]	\[Ccpp\](white)	\[ccpp\](white)

Therefore, the percentage of coloured flowers in offsprings 25%.