120 Plants are produced on crossing pure red and pure white flowered pea plants. The ratio will be 90 Red : 30 White 30 Red : 90 White 60 Red : 60 White All Red  

Dear Student.
Please find below the solution to the asked query.

The correct answer is all will be red flower after crossing.

As both the parents are pure line red or white i.e homozygous dominant or recessive, so the crossing result will produce all red flower. But the pure line will not be maintained. The flower will be heterozygous red.

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