When a cross is made between a tall plant with yellow seeds (TtYy) and a tall plant with green seeds (Ttyy), what is true regarding the proportions of the offspring's phenotypes?

NEET Biology question

When a cross is made between a tall plant with yellow seeds () and a tall plant with green seeds (), what is true regarding the proportions of the offspring's phenotypes?

(A)Proportion of tall-and-green = 3/8, proportion of dwarf-and-green = 1/8Correct
(B)Proportion of tall-and-green = 2/8, proportion of dwarf-and-green = 1/8
(C)Proportion of tall-and-green = 1/8, proportion of dwarf-and-green = 3/8
(D)Proportion of tall-and-green = 2/8, proportion of dwarf-and-green = 2/8

Answer: (A)

Solution

At the height locus, gives a 3:1 (tall:dwarf) ratio. At the seed-colour locus, gives a 1:1 (yellow:green) ratio. Combining independently: tall-and-green \tfrac\tfrac$12

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Question ID VK-120305