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CBSE 12th Standard Biology Subject Principles of Inheritance and Variation Ncert Exemplar 1 Marks Questions 2021

Published on: 25/05/2021

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Std: 12th Standard CBSE - Biology

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Questions:

1 Marks

9 x 1 = 9

Write an example where Punnett square can be effectively used.

Man produces 2 types of sperms.Is it true?

Which is dominant a factor (gane) for round seeds or for wrinkled seeds?

Two genes 'A' and 'B' are linked. In a dihybrid cross involving these two genes, the F₁ heterozygote is crossed with homozygous recessive parental type (aabb). What would be the ratio of offspring in the next generation?

A cross between two tall plants resulted in offspring, having few dwarf plants. What would be the genotypes of both the parents?

Do you think Mendel's law of inheritance would have been different if the characters he chose were located on the same chromosome? Why?

What is the cross between the progeny of F₁ and the homozygous recessive parent called? How is it useful?

What is the genetic basis of wrinkled phenotype of pea seed?

What are the characteristic features of a true-breeding line?

Generic 2

1 x 2 = 2

10.

In order to obtain the F₁ generation, Mendel pollinated a pure-breeding tall plant with a pure-breeding dwarf plant. But, for getting the F₂ generation, he simply self-pollinated the tall F₁ plants. Why?

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Answers Key:

1 Marks

9 x 1 = 9

()
Punnett square can be effectively used to understand the independent segregation of the two pairs of genes during meiosis.

()
Yes

()
Round seeds

()
The ratio of offspring would be:

AaBb : Aabb : aaBb : aabb

1 1 1 1

()
Both the parents must be heterozygous for tallness, i.e. Tt.

()
Mendel could not have framed the law of independent assortment, if the genes for all the characters Mendel chose, were present on the same chromosome and showed the phenomenon of linkage.

()
- It is called a test cross.

- It helps to determine the genotype of the F₁ individual with dominant phenotype.

()
Wrinkled seed-shape is a recessive trait; it is expressed only under the homozygous condition of the alleles.

()
Characteristics of a true-breeding line:
(i) A true-breeding line has undergone continous self-pollination.
(ii) It shows stability in the inheritance of the trait for several generations.

Generic 2

1 x 2 = 2

10.

Characters segregate during gamete formation. Pure-breeding parents give rise to F₁ with heterozygous conditions. Only self-pollination of heterozygous can result in all possible recombinations of characters in progeny since the mating is random.