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Class 10 Heredity Exercise 4.1 Solutions | Science and Technology Curriculum Development Centre

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1) Choose the correct option for the given questions:

Question a)
Asked by Atith Adhikari

How many pairs of sex chromosomes are found in the human cell?

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Question b)
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What is a chromosome made up of?

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Question c)
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What is the main function of sex chromosomes?

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Question d)
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What is the smallest unit of the chromosome that helps in the transmission of hereditary characteristics?

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Atith Adhikari Atith Adhikari ยท 1 year ago
Verified

Solution

Option D is the correct answer.

Gene is the smallest unit of the chromosome that helps in the transmission of hereditary characteristics from parents to their offspring.

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Question e)
Asked by Atith Adhikari

Which of the following statements is correct for mitotic cell division?

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Question f)
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A technician working in a radiotherapy laboratory was tested after a long time of marriage when there was no childbirth. After the test, it was found that his child production capacity was reduced because he worked in high-intensity radiation for a long time. Which part of the cell is affected in this case?

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Question g)
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If there is no DNA transcription in a cell, which process is affected?

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Question h)
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If a nulceotide is destructed during DNA replication, what happens to the organism?

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Question i)
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Which of the following indicates the set of chromosomes in a cell of a woman?

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Question j)
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Which of the following statements is true?

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2) Write differences:

Question a)
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Differentiate: Autosome and Sex Chromosome

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Question b)
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Differentiate: Mitosis and Meiosis

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Question c)
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Differentiate: DNA and RNA

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Question d)
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Differentiate: Haploid and Diploid

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3) Give reason:

Question a)
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Offspring have the same characteristics as their parents. Explain.

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Question b)
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The male has a main role in the determination of sex. Give reason.

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Question c)
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Though males have both X and Y chromosomes, some of them have only male or only female kids. Why?

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Question d)
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Meiotic cell division is also called reductional cell division. Why?

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Question e)
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Mitotic cell division is also called equational cell division. Why?

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Question f)
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Sexual reproduction is impossible without meiotic cell division. Why?

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Question g)
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Meiotic cell division brings variation. How?

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About the Textbook

Name: Science and Technology - Grade 10
Author: Government of Nepal, Ministry of Education, Science, and Technology
Publisher: Curriculum Development Centre
Sanothimi, Bhaktapur