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In watermelons, bitter fruit (B) is dominant over sweet fruit (b), and yellow spots (S) are...

In watermelons, bitter fruit (B) is dominant over sweet fruit (b), and yellow spots (S) are dominant over no spots (s). The genes for these two characteristics assort independently. A homozygous plant that has bitter fruit and yellow spots is crossed with a homozygous plant that has sweet fruit and no spots. The F1 are crossed to produce the F2.

  1. (a) What are the phenotypes with corresponding phenotypic ratios of the F2?

  2. (b) If an F1 plant is backcrossed to the bitter, yellow-spotted parent, what phenotypes and

    proportions are expected in the offspring?

  3. (c) If an F1 plant is backcrossed to the sweet, non-spotted parent, what phenotypes and proportions

    are expected in the offspring?

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Ans:

(a) When a homozygous plant with bitter fruit and yellow spots is crossed with a homozygous plant with sweet fruit and no spots, all the F1 plants are heterozygous bitter fruit with yellow spot (BbSs). After that the F1 plants are crossed to produce bitter fruit, yellow spot: bitter fruit, no spot: sweet fruit, yellow spot: sweet fruit, no spot in a ratio of 9:3:3:1 at F2. The cross is given below-

(b) If an F1 plant is backcrossed to the bitter, yellow-spotted parent, all bitter, yellow spotted plant are produced in a ratio 4:0. The cross is given below-

(c) If an F1 plant is backcrossed to the sweet, non-spotted parent, bitter fruit, yellow spot, bitter fruit, no spot, sweet fruit, yellow spot, sweet fruit, no spot plants are produced in a ratio of 1:1:1:1. The cross is given below-

gladiator answered 1 year ago
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