In sweet peas, genes C and P are necessary for colour in the flower. The flowers are white in the absence of either or both the genes. What will be the percentage of colour flower in offspring of the cross Ccpp *ccPP?

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50%

25%

40%

None of the above

answer is C.

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Detailed Solution

Concept- For colour in flower, presence of both dominant alleles P & C gene are necessary.
In the above question, It is clear that both P & C genes are complementary, which means they both are necessary for the expression of a particular phenotype. For colour in flower, the presence of both dominant alleles P & C gene is necessary.
When, Ccpp is crossed with ccPP, it will respectively segregate into gametes Cp, cp and cP, cP. The offsprings produced will be-

Gametes	Cp	cp
cP	CcPp	ccPp
	Coloured flower	White flower

As we have seen in the explanation, the ratio will be 1:1 that is 50% will be coloured flower and 50% will be white.
Hence, option 1 is the correct answer.

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