Pure-bred tall pea plants are first crossed with pure-bred dwarf pea plants. The pea plants obtained in F1 generation are then cross-bred to produce F2 generation of pea plants.(a) What do the plants of F1 generation look like?
(b) What is the ratio of tall plants to dwarf plants in F2 generation?
(c) Which type of plants were missing in F1 generation but reappeared in F2 generation?
(a) In the F1 generation, all the plants are tall (because tall is a dominant trait).
(b) In the F2 generation, the ratio of tall plants to dwarf plants is 3:1.
(c) Dwarf plants are not present in F1 generation but will be reappeared in the F2 generation.
During F1 generation, all the plants appeared are tall in nature (because tallness is dominant over dwarfness). But in the F2 generation, dwarfness will reappear in pure-dwarf plants (tt).
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.
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