Given below is a schematic diagram showing Mendel's experiment on sweet pea plants having axial flowers with round seeds (AARR) and terminal flowers with wrinkled seeds (aarr). Study the same and answer the questions that follows

(iv) Name and explain the law introduced by Mendel on the basis of the above observation.

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Solution

(iv) Mendel introduced the law of independent
assortment on the basis of above observation.

The law of independent assortment states that ‘when two pairs of contrasting characters are combined in a hybrid, segregation of one pair of character is independent of the other pair of character at the time of gamete formation’.

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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.

(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?

Q. Given below is a schematic diagram showing Mendel's experiment on sweet pea plants having axial flowers with round seeds (AARR) and terminal flowers with wrinkled seeds (aarr). Study the same and answer the questions that follows

Diagram

Q. Given below is a schematic diagram showing Mendel's experiment on sweet pea plants with yellow round seeds (YYRR) and green wrinkled seeds (yyrr). Answer the questions that follows

(iv) Name the law deduced by Mendel on the basis of above observations.

Q. Given below is a schematic diagram showing Mendel's Experiment on sweet pea plants having axial flowers with round seeds (AARR) and terminal flowers with wrinkled seeds(aarr). Study the same and answer the questions that follow: [5 MARKS]

(a) Give the phenotype of F1 progeny.
(b) Give the phenotypes of F2 progeny produced by the self-pollination of F1 progeny.
(c) Give the phenotypic ratio of F2 progeny.
(d) Name and explain the law induced by Mendel on the basis of the above observation.

Given below is a schematic diagram showing Mendel's Experiment on sweet pea plants having axial flowers with round seeds (AARR) and Terminal flowers with wrinkled seeds, (aarr) Study the same and answer the question that follows.

Give the phenotypic ratio of F₂ progeny.

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Laws of Mendel

Standard X Biology

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