Question

Give reason for your choice. A person first crossed pure-breed pea plants having round-yellow seeds with pure-breed 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-breed by self-pollination, then in addition to the original round yellow and wrinkled-green seeds, two new varieties A-D and C-B types of seeds were also obtained. What are C-B type of seeds? (a) Round-yellow (b) Wrinkled-green (c) Round-green (d) Wrinkled-yellow Explain with the help of Punnet Square​

Answer 1

Explanation:

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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.