Question

What are chromosomes? Explain how in
sexually reproducing organisms the number of chromosomes in the progeny is maintained.
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Answer 1

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$<b>$Chromosomes are made of proteins and DNA. They are present in the nuclei of the cells.

In sexually reproducing organisms, the gametes undergo meiosis and hence, each gamete contains only half set of chromosomes. When two gametes fuse, the zygote formed contains the full set of chromosomes.Hence, the formation of gametes by meiosis helps to maintain the number of chromosomes in progenies.

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Answer 2

Explanation:

1. the structure in the nucleus of cells which carries the heriditary characters it is called as chromosome.

2. chromosomes is mainly made up of nucleus acid and proteins.

3. jeans which contain the information about hereditary characteristics it is present in the chromosomes and it can be seen clearly by compound microscope.

4. each chromosome is made up of DNA

5. the centromere is present in the centre of chromosomes with divides the chromosomes into two parts.

6. each parts of chromosomes is known as an Arm.