In a particular plant species majority of the plants bear purple flowers. Very few plants bear white flowers. No intermediate colors are observed. If you are given a plant with purple flowers, how would you confirm that its a pure breed for that trait?

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Solution

The genotype can be confirmed by carrying out a test cross, i.e. crossing the plant with a recessive white flowered flower.

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In the pea plant, purple color of flower is dominant over white color. Progeny obtained by crossing pure purple flowered plants with white flowered plants are self-pollinated. The resulting plants produced are:

Q. A plant with purple flowers was crossed with white flowers producing 50 plants with only purple flowers. Selfing these plants produced 482 plants with purple flowers and 162 plants with white flowers. What genetic mechanism accounts for these results? Explain. [3]

Q. Three Mark Questions :
A plant with purple flowers was crossed with white flowers producing 50 plants with only purple flowers. On selfing these plants produced 482 plants with purple flowers and 162 plants with white flowers. What gametic mechanism accounts for these results? Explain.

The genotype of purple flowered pea plants is denoted as WW and that of white flowered pea plants as ww. When these two are crossed?

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progeny?

Q. Application based questions.
A pea plant with purple flowers was crossed with white flowers, producing 50 plants with only purple flowers. On selfing, these plants produced 482 plants with purple flowers and 162 with white flowers. What genetic mechanism accounts for these results? Explain.

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