Pure tall x pure short pea plants: the F1 and F2 plants
The same question, asked 4 times: 2023*, 2024*, 2025*, 2026. Every wording below, oldest first.
Try each one first, then open its answer.
Question 1
2023
23Mendel crossed a pure tall pea plant (TT) with a pure short pea plant (tt) and obtained all tall plants in generation. (a) What is the gene combination present in the plants of generation ? (b) Give reason why only tall plants are observed in progeny. (c) What will be the ratio of the plants obtained in the generation when plants are self-pollinated ?Question 2
2024
30(a) Name any two pairs of contrasting characters other than height used by Mendel in his experiments. (b) On crossing a tall and a short pea plant, Mendel obtained generation in which all pea plants were tall. (i) Are these plants exactly the same as tall plants of the parent generation ? Write their gene combination. (ii) Give the percentage of short plants obtained in generation when plants are self-pollinated. (iii) In what ratio would you find TT and Tt in generation ?Question 3
2024
30Mendel crossed pure tall pea plants (TT) with pure short pea plants (tt) and obtained progeny. When the plants of progeny were self-pollinated, plants of progeny were obtained. (a) What did the plants of progeny look like ? Give their gene combination. (b) Why could the gene for shortness not be expressed in plants of progeny ? (c) Write the ratio of the plants obtained in progeny and state the conclusion that can be drawn from this experiment.Question 4
2025
24Pure-tall (TT) pea plants are crossed with pure-dwarf (tt) pea plants. The pea plants obtained in generation are then self pollinated to produce generation. (i) What do the plants of generation look-like? Justify your answer. (ii) What is the ratio of pure-tall plants to pure-dwarf plants in generation ?Question 5
2026
14Show the cross and observations made by Mendel when he crossed pure tall pea plant with a pure short pea plant to get progeny.