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Question

A Mendelian experiment consists of breeding tall pea plants bearing violet flowers with short pea plants bearing white flowers. The progeny all bore violet flowers, but almost half of them were short. This suggests that the genetic makeup of the tall parent can be depicted as:-
(i)TTWW (ii)TTww (iii)TtWW (iv)TtWw

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Solution

The genetic makeup of the tall parent can be depicted as TtWW. Since all the progeny has violet flowers so the genotype of tall plant for violet flower color should be WW. Secondly, since almost half of the progeny is short this suggests that the tall plant is not pure and possesses the genotype Tt. So if the cross is made between the tall parent TtWW and other parent ttww, genotype of the progeny obtained is TtWw (8): ttWw (4): ttWw (4).


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