In order to trace the inheritance of traits Mendel crossed pea plants having one contrasting character or a pair of contrasting characters. When he crossed pea plants having round and yellow seeds with pea plants having wrinkled and green seeds, he observed that no plants with wrinkled and green seeds were obtained in the F₁ generation. When the F₁ generation pea plants were cross-bred by self-pollination, the F₂ generation had seeds with different combinations of shape and colour also.
(a) Write any two pairs of contrasting characteristics of pea plant used by Mendel other than those mentioned above.
(b) Differentiate between dominant and recessive traits.
(c) State the ratio of the combinations observed in the seeds of F₂ generation (in the above case). What do you interpret from this result ?
OR
(c) Given below is a cross between a pure violet flowered pea plant (V) and a pure white flowered pea plant (v). Diagrammatically explain what type of progeny is obtained in F₁ generation and F₂ generation :
Pure violet flowered plant (VV) x Pure white flowered plant (vv)

Question

In order to trace the inheritance of traits Mendel crossed pea plants having one contrasting character or a pair of contrasting characters. When he crossed pea plants having round and yellow seeds with pea plants having wrinkled and green seeds, he observed that no plants with wrinkled and green seeds were obtained in the F₁ generation. When the F₁ generation pea plants were cross-bred by self-pollination, the F₂ generation had seeds with different combinations of shape and colour also.
(a) Write any two pairs of contrasting characteristics of pea plant used by Mendel other than those mentioned above.
(b) Differentiate between dominant and recessive traits.
(c) State the ratio of the combinations observed in the seeds of F₂ generation (in the above case). What do you interpret from this result ?
OR
(c) Given below is a cross between a pure violet flowered pea plant (V) and a pure white flowered pea plant (v). Diagrammatically explain what type of progeny is obtained in F₁ generation and F₂ generation :
Pure violet flowered plant (VV) x Pure white flowered plant (vv)

KnowledgeBoat · Accepted Answer

(a) Two pairs of other contrasting characteristics of pea plant used by Mendel are:

Purple flower and white flower
Tall plant and short plant

(b) Differences between dominant and recessive traits:

Dominant traits	Recessive traits
They mask the effect of recessive traits.	They are masked by dominant trait in heterozygous condition.
They express themselves in homozygous condition as well as heterozygous condition.	The always express themselves in homozygous condition.
The allele for dominant traits are expressed in capital letters.	The allele for recessive traits are expressed in small letters.
For example: tall plant in pea.	For example: short plant in pea.

(c) All plants in F₁ generation (in the above case) will have round and yellow seeds. In F₂ generation, the phenotypic ratio will be 9:3:3:1.

It is clear from the result that the allele showed independent assortment during gamete formation and combined to give four different phenotypes in ratio 9:3:3:1.

OR

(c) Diagram explaining the type of progeny in F₁ generation and F₂ generation is shown below:

In order to trace the inheritance of traits Mendel crossed pea plants having one contrasting character or a pair of contrasting characters. When he crossed pea plants having round and yellow seeds with pea plants having wrinkled and green seeds, he observed that no plants with wrinkled and green seeds were obtained in the F1 generation. When the F1 generation pea plants were cross-bred by self-pollination, the F2 generation had seeds with different combinations of shape and colour also. (a) Write any two pairs of contrasting characteristics of pea plant used by Mendel other than those mentioned above. (b) Differentiate between dominant and recessive traits. (c) State the ratio of the combinations observed in the seeds of F2 generation (in the above case). What do you interpret from this result ? OR (c) Given below is a cross between a pure violet flowered pea plant (V) and a pure white flowered pea plant (v). Diagrammatically explain what type of progeny is obtained in F1 generation and F2 generation. Pure violet flowered plant (VV) x Pure white flowered plant (vv). CBSE 2023 Science Class 10 Question Paper Solved.

Violet flower colour is dominant trait and white flower colour is recessive trait in pea. When pure violet flowered plant (VV) is crossed with pure white flowered plant (vv), the F₁ generation will have all violet flowered plants (Vv). In F₂ generation, the ratio of plants with purple flower and white flower will be 3:1. The genotypic ratio will be 1:2:1.

Science

Genetics

Answer

Related Questions