In the garden pea, violet flowers is dominant to white flowers. A true-breeding

Question

In the garden pea, violet flowers is dominant to white flowers. A true-breeding violet flowered strain is crossed with a true-breeding white flowered strain. The F_1 generation is self crossed to make an F_2 generation. Each of the F_2 plants is then self crossed, to make an F_3 generation. A. Of the white-flowered F_2plants, what fraction is only capable of producing white-flowered F_3 plants? B. Suppose that I make an F_3 generation by self-pollinating individual F_2 plants. For each self- pollinated F_2 plant, I plant a sample of its seeds in one group so I can keep track of which F_3 plants came from the same F_2 plant. Of the violet flowered F_2 plants, what fraction would only be capable of producing violet-flowered F_3 plants when self pollinated?

Explanation / Answer

Answer:

In F2 generation, 75% plants are violet-flowered among which 25% are VV, Homozygous for violet-flowered alleles and remaining 50% plants are Vv, heterozygous for violet-flowered alleles. Only 25% plants are pure white-flowered plants (vv).

A). All homozygous white-flowered plants (25%) and heterozygous violet-flowered plants (50%) produces white- flowered plants. Total 75% plants produce white-flowered plants.

But only 25% of white-flowered plants produce all white-flowered progeny.

B).

All homozygous violet-flowered plants (25%) and heterozygous violet-flowered plants (50%) produces violet-flowered plants. Total 75% plants produce violet-flowered plants.

But only 25% of violet-flowered plants produce all violet-flowered progeny.

Heterozygous violet-flowered plants on self-pollination produce 75% violet-flowered plants, 25% white-flowered plants.

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