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Monohybrid Cross

Mendel first ...

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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 $F_{1}$ 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.

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

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Solution

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

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Q. 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?

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}

generation. When

F_{1}

generation pea plants having A-B type of seeds were cross-bred by self-pollination, then in addition to the original round-yellow and wrinkled-green seeds, two new varieties A-D and C-B type of seeds were also obtained.

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}

generation. When

F_{1}

generation pea plants having A-B type of seeds were cross-bred by self-pollination, then in addition to the original round-yellow and wrinkled-green seeds, two new varieties A-D and C-B type of seeds were also obtained.
(b) State whether A and B are dominant traits or recessive traits.

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Monohybrid Cross

Standard X Biology

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