In cucumbers, dull fruit (D) is dominant over glossy fruit (d), orange fruit (R)

ID: 96873 • Letter: I

Question

In cucumbers, dull fruit (D) is dominant over glossy fruit (d), orange fruit (R) is dominant over cream fruit (r), and bitter cotyledons (B) are dominant over nonbitter cotyledons (b). The three characters are encoded by genes located on different pairs of chromosomes. A plant homozygous for dull, orange fruit and bitter cotyledons is crossed with a plant that has glossy, cream fruit and nonbitter cotyledons. The F_1 are intercrossed to produce the F_2. Give the expected proportion of offspring with a dull, orange, and bitter phenotype or a glossy, orange, and bitter phenotype in the F_2. 9/64 27/64 9/16 1/4 3/128

Explanation / Answer

Parental genotype= DD RR BB and dd rr bb

F1 generation = Dd Rr Bb

Probability of dull/orange/bitter = 3/4 * 3*4 * 3/4 = 27/64

Probability of glossy/orange/bitter = 1/4 * 3/4 * 3/4 = 9/64

Here the question says "OR", so we need to use Addition rule-

P = P[a] + P[b] = 27/64 + 9/64 = 36/64 = 9/16.

Answer: Option 3

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In cucumbers, dull fruit (D) is dominant over glossy fruit (d), orange fruit (R)

In cucumbers, dull fruit (D) is dominant over glossy fruit (d): orange fruit (R)

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In cucumbers, dull fruit (D) is dominant over glossy fruit (d), orange fruit (R)

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