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 $F_{1}$ generation. When $F_{1}$ 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?

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Solution

(a)

(i) Number of round green seeds = $\frac{2160}{16} \times 3 = 405$

(ii) Number of wrinkled green seeds = $\frac{2160}{16} \times 1 = 135$

(iii) Number of round yellow seeds = $\frac{2160}{16} \times 9 = 1215$

(iv) Number of wrinkled yellow seeds = $\frac{2160}{16} \times 3 = 405$

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

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A cross between pure-bred pea plants having yellow round seeds with those having green wrinkled seeds would produce $F_{1}$ plants with:

Q. A person first crossed pure-bred pea plants having round-yellow seeds with pure-bred pea plants having wrinkled-green seeds and found that only A-B type of seeds were produced in the

F_{1}

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F_{1}

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A pea plant with round and yellow seeds (RRYY) is crossbred with another pea plant having wrinkled and green seeds (rryy). Among the offspring obtained in F₂ generation, plants with which traits were found to be maximum in number?

Question 5
If a round, green-seeded pea plant (RRyy) is crossed with wrinkled, yellow-seeded pea plant (rrYY), the seeds produced in F1 generation are

(a) round and yellow
(b) round and green
(c) wrinkled and green
(d) wrinkled and yellow
( Round-R, Green-y, Wrinkled-r, Yellow-Y)

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(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).