NCERT Solutions for Class 10 Science Chapter 8 – Heredity

Chapter 8 – Heredity

Intext Questions with Solutions of Class 10 Science Chapter 8 – Heredity

1.

Ans: Characteristic B, since it is shared by a larger percentage of the population. It has now infected 60% of the population and probably started earlier. Only 10% of people have developed Trait A yet, since it is very new.

2.

Ans: Genetic variants allow a species to better adapt to changes in its environment. Furthermore, it is a crucial force in evolution since it permits the frequency of alleles to rise or decrease via natural selection. These variances will determine whether the species is extinct or continues to exist.

3.

Ans: In 1856, Mendel started his genetic experiment on pea plants using a monohybrid cross, which had one character and two alternate features. True-breeding dwarf plants and true-breeding tall plants (TT) were crossed. He was given only tall plants in the first filial generation; no dwarf traits were observed. The F1 progeny were then self-pollinated, producing both tall and dwarf plants. Mendel came to the conclusion that features have two types: one is dominant and the other is recessive. This was based on the monohybrid cross. The dominant trait is an allele that constantly shows itself on the outside, while the recessive trait is hidden when the dominant trait is present in homozygous or heterozygous situations. So, homogyous states are the only ones in which the recessive characteristic manifests. The tall plants in F1 were eventually not true-breeding. They were tall, heterozygous plants (Tt). As a result, the dominant allele suppresses the expression of the recessive allele (t).

4.

Ans: Mendel performed dihybrid crossings by crossing two pairs of characteristics that alternately expressed themselves. The prominent qualities were those that emerged in the first generation. Plants of various kinds were created when he employed these F1 offspring to make F2 offspring by self-pollination. There were plants that had both dominant traits, plants that had both recessive features, and plants that had mixed traits. This suggests that characteristics are inherited separately.

5.

Ans: This information is insufficient. This is due to the fact that every person has two alleles. Only when the alleles are comparable may the recessive characteristic manifest. If blood group O is recessive and blood group A is dominant, then a daughter can only have blood group O if the mother carries both recessive alleles together and the father carries one allele of O and one of A.

6.

Ans: In humans, the men determine the child’s sex. The XY and XX chromosomes are found in males and females, respectively. Therefore, if:

The mother gives birth to a girl when the X chromosomes of the male and female join.
When the female’s X and male Y chromosomes unite, the mother gives birth to a boy.

Exercise Questions with Solutions of Class 10 Science Chapter 8 – Heredity

1.

Ans: (c) TtWW

2.

Ans: It is impossible to determine if a given trait is dominant or recessive since knowledge of at least three generations is necessary to determine whether an attribute is dominant or recessive.

3.

Ans: Dogs possess a specific array of genes that regulate coat color. At least eleven identified sequence series (A, B, C, D, E, F, G, M, P, S, T) affect a dog’s coloration. A dog receives one allele from each parent. For instance, in the B series, a dog is genetically either black or brown. One parent is homozygous for black pigmentation (BB), while the other parent is homozygous for brown pigmentation (bb).

In this instance, all progeny will be heterozygous (Bb).
Given that black (B) is a dominant trait, all progeny will exhibit the black phenotype. Nonetheless, they will possess both B and b alleles. Crossing these heterozygous pups will yield 25 homozygous black (BB), 15 heterozygous black (Bb), and 25 homozygous brown (bb) offspring.

4.

Ans: Couples of chromosomes hold genetic information in most living things. Meiosis is the process that makes gametes in sexually reproducing organisms. During this process, half of the genetic material passes into each gamete. During sexual reproduction, the male and female gametes come together and reestablish the proper complement. The female contributes fifty percent of the genetic material, while the male contributes the other fifty percent.

Related Study Resources of Chapter 8 – Heredity

Students can use the links below to get extra study materials for Class 10 Science Chapter 8: Heredity.

Sl No.	Related Links
1	Class 10 Science Chapter 8 Heredity – Important Questions
2	Class 10 Science Chapter 8 NCERT Textbook

Download Heredity NCERT Solutions PDF

You can download the PDF from the link below for offline study