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Pure-bred tall pea plants are first cros...

Pure-bred tall pea plants are first crossed with pure-bred dwarf pea plants. The pea plants obtained in `F_(1)` generation are then cross-bred to produce `F_(2)` generation of pea plants.
(a) What do the plants of `F_(1)` generation look like?
(b) What is the ratio of tall plants to dwarf plants in `F_(2)` generation?
(c ) Which type pf plants were missing in `F_(1)` generation but reappeared in `F_(2)` generation?

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