Violet x white flowers: F1 colour and the share of white in F2
The same question, asked 4 times: 2022*, 2024*, 2025*, 2026. Every wording below, oldest first.
Try each one first, then open its answer.
Question 1
2022
5 (b)(i) In a cross between violet flowered plants and white flowered plants, state the characteristics of the plants obtained in the progeny. (ii) If the plants of progeny are self-pollinated, then what would be observed in the plants of progeny ? (iii) If 100 plants are produced in progeny, then how many plants will show the recessive trait ?Question 2
2024
30A plant with violet flowers (VV) was crossed with a plant with white flowers (vv). (a) What colour of flowers was obtained in the plants of generation and why ? (b) Write the percentage of plants with white flowers in generation plants, if plants were self-pollinated. Give reason why this trait was not expressed in generation. (c) In what ratio did we get the plants with (VV) and (Vv) gene combination in the generation ?Question 3
2025
30The gene combination of purple flowered pea plants is denoted as (WW) and that of white flowered pea plants as (ww), when these two plants are crossed generation is obtained. (a) List two observations made by Mendel in generation plants. (b) Give the (i) percentage of white flowered plants and (ii) ratio of the gene combinations WW, Ww and ww in generation. (c) Write one difference between dominant and recessive trait.Question 4
2026
13A blue colour flower (BB) bearing plant is crossed with a plant with white coloured flowers (bb). (a) State the colour of the flowers you would expect in their progeny. (b) What must be the percentage of white flower plants in the generation, if the plants are self-pollinated ? (c) State the expected ratio of genotypes BB and bb in progeny.