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A person first crossed pure-bred pea plants having round-yellow seeds with pure-bred pea plants having wrinkled-green seeds and found that only A-B type of seeds were produced in the F1 generation. When F1 generation pea plants having A-B type of seeds were cross-bred by self-pollination, then in addition to the original round-yellow and wrinkled-green seeds, two new varieties A-D and C-B type of seeds were also obtained.(a) What are A-B type of seeds?
(b) State whether A and B are dominant traits or recessive traits.
(c) What are A-D type of seeds?
(d) What are C-B type of seeds?
(e) Out of A-B and A-D types of seeds, which one will be produced in (i) minimum numbers, and (ii) maximum numbers, in the F2 generation?
When pure-bred pea plants having round-yellow seeds (RRYY) crossed with pure-bred pea plants having wrinkled-green seeds (rryy),
(a) A-B type of seeds produced in the first generation (F1 generation) is round and yellow (RrYy).
(b) A (round) and B (yellow) are dominant traits, as they expressed themselves in F1 generation.
When F1 generation pea plants having A-B type of seeds, that is RrYy (round and yellow) were cross-bred by self-pollination, it produces original round-yellow (RRYY) and wrinkled-green (rryy) seeds, and two new varieties A-D and C-B type of seeds.
(c) A-D type of seeds produced are round and green (RRyy or Rryy) in nature.
(d) C-B type of seeds produced are wrinkled and yellow (rrYY or rrYy) in nature.
(e) In the F2 generation, out of A-B and A-D type of seeds, (i) A-D (round and green) types of seeds will be produced in minimum numbers and (ii) A-B (round and yellow) types of seeds will be in maximum numbers.
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