Grade-10 (SEE) Chapter=Chromosome and Sex Determination

Chromosome and Sex Determination

 Here are the notes of the chapter Chromosome and Sex Determination:

1. The thread-like structures found in the nucleus of all cells which carry hereditary information are called chromosomes.

2. A particular segment of DNA molecule which determines the heredity of a particular trait is called a gene.

3. During interphase the genetic material is in the form of a network of very long, extremely thin, dark, staining fibers called chromatin fiber or thread.

4. The two chromatids of chromosomes are joined to each other by a beaded-like structure which is called the centromere.

5. The identical male and female parent chromosomes occur in pairs is known as the homologous chromosome.

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Test yourself

1. What is a chromosome?

2. What is a gene?

3. What is the composition of gen?

4. What determines the characteristics of a living organism?

5. What are sex-linked diseases?

6. What is a sex chromosome?

7. Some people have only four daughters in a row and no son. Does it mean that the husband does not produce y-bearing sperms?

8. Which chromosomes are responsible for sex determination?

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