Question

If dominant C and P genes are essential for the development of purple colour in sweet pea flowers, what would be the ratio of white and purple colour in a cross between CcPp and Ccpp?

• A. 5:3
• B. 9:7
• C. 2:6
• D. 6:2

Answer 1

The correct option is A 5:3

Flower colour of Sweet Pea is governed by two complimentary genes namely C and P. The double dominant condition (C_P_) gives purple flowers while the absence of double dominant condition produce white flowers. The cross between CcPp and Ccpp produce white and purple flowers in 5:3 ratio. Correct option is A.

Gametes : CcPp --> Ccpp	CP	Cp	cP	cp
Cp	CCPp (purple)	CCpp (white)	CcPp (purple)	Ccpp (white)
cp	CcPp (purple)	Ccpp (white)	ccPp (white)	ccpp (white)