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

Published on: 25/05/2021

QB365 Provides the updated NCERT Examplar Questions for Class 12 Biology, and also provide the detail solution for each and every ncert examplar questions , QB365 will give all kind of study materials will help to get more marks

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Std: 12th Standard CBSE - Biology

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Questions:

1 Marks

9 x 1 = 9

State the reasons of chromosomal disorders.

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?

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

Even if a character shows multiple allelism an individual will only have two allels for that character. Why?

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

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

()
Chromosomal disorders are caused due to excess, absence of abnormal arrangement of one or more chromosomes.

()
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

()
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.

()
A diploid individual has only two sets of homologous chromosomes; hence only two alleles of a gene can be present on the homologous pair of chromosomes.

()
- It is called a test cross.

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

()
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.