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Mendel first crossed pure-bred pea plants having round -yellow seeds with pure-bred pea plants having wrinkled -green seeds and found that only round- yellow seeds were produced in the F1 generation. When F1 generation pea plants having round-yellow seeds were cross-bred by self-pollination, then peas having round-yellow seeds, round green seeds, wrinkled-yellow seeds and wrinkled -green seeds were produced. Mendel collected a total of 2160 seeds.

(a) What will be the number of (i) round green seeds (ii) wrinkled green seeds    (iii) round yellow seeds, and (iv) wrinkled-yellow seeds?

(b) Which 'ratio' as established by Mendel have you made use of in answering the part (a) above?


Solution

(a)

(i) Number of round green seeds = 216016×3=405

(ii) Number of wrinkled green seeds = 216016×1=135

(iii) Number of round yellow seeds = 216016×9=1215

(iv) Number of wrinkled yellow seeds =216016×3=405

(b) The dihybrid ratio (which is 9: 3: 3: 1) has been used to answer part (a).

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