The trait of medium-sized leaves in iris is determined by the genetic condition PP′. Plants with large leaves are PP, whereas plants with small leaves are P′P′. A cross is made between two plants each with medium-sized leaves. If they produce 80 seedlings, what would be the expected phenotypes, and in what numbers would they be expected?

Question

Biology

Jolie Harvey

4 July, 11:37

The trait of medium-sized leaves in iris is determined by the genetic condition PP′. Plants with large leaves are PP, whereas plants with small leaves are P′P′. A cross is made between two plants each with medium-sized leaves. If they produce 80 seedlings, what would be the expected phenotypes, and in what numbers would they be expected?

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Quentin Sexton · Answer 1

20 large size leaves plants

40 medium sized leaves plants

20 small sized leaves.

Explanation:

PP = large leaves

P'P' = small leaves

PP' = medium leaves

PP' was crossed with another PP' plant:

PP' x PP'

progeny = PP, 2PP', and P'P'

PP = 1/4 x 80 = 20 large size leaves plants

PP' = 1/2 x 80 = 40 medium sized leaves plants

P'P' = 1/4 x 80 = 20 small sized leaves.

Hence the phenotypes would be:

20 large size leaves plants

40 medium sized leaves plants

20 small sized leaves.