A cassava farmer in Dominica notices that when she crosses two cassava plants that are both heterozygous for leaf shape (Ll × Ll), she obtains 64 offspring. Lobed leaves (L) are dominant to entire leaves (l). Which of the following is the expected number of plants with entire leaves?

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Question

A cassava farmer in Dominica notices that when she crosses two cassava plants that are both heterozygous for leaf shape (Ll × Ll), she obtains 64 offspring. Lobed leaves (L) are dominant to entire leaves (l). Which of the following is the expected number of plants with entire leaves?

Accepted Answer

16 — Award 1 mark for correct calculation. From Ll × Ll, the expected phenotype ratio is 3 lobed : 1 entire. Plants with entire leaves have genotype ll = 1/4 of total. Calculation: 64 × 1/4 = 16. B is incorrect — 32 would be 1/2. C is incorrect — 48 would be 3/4 (expected lobed plants). D is incorrect — this is the total number of offspring.

Answer

16

Answer

32

Answer

48

Answer

64

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