Question

What will be the appearance of (a) F1 and (b) F2 progenies when a

pure (homozygous) tall pea plant is crossed with a pure

(homozygous) dwarf pea plant?

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Answer 1

Answer:

What will be the appearance of (a) F1 and (b) F2 progenies when a pure (homozygous) tall pea plant is crossed with a pure (homozygous) dwarf pea plant? In F1 generation all the plants will be heterozygous tall (Tt) .

Explanation:

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Answer 2

(a) In the F1 generation, all the plants will be tall.

(b)The F2 generation, out of four plants, three will be tall and one dwarf.

Explanation:

In pea plant, when pure tall pea plant (TT) is crossed with pure short (tt) plant,

F1 generation will be all Tt (tall plant).

                                      (Pure Tall)   TT        x        tt   (Pure short)

F1 generation                                                 Tt    (All tall plant)

Self-pollination                                Tt         x         Tt

F2 generation                        TT           Tt           Tt           tt

                                                    1                      2                     1

Thus, the ratio of pure tall plants (TT) to heterozygous breed tall plants (Tt) to pure short plants (tt) is 1:2:1.