Question

What are chromosomes? Explain how in sexual reproducing orgainisms the number of chromosomes in the progeny is maintained. (Class-10)
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Answer 1

a part of a cell in living things that decides the sex, character, shape, etc. that a person, an animal or a plant will be a boy or girl or a black or white.....

Answer 2

a part of a cell in living things that decides the sex, character, shape, etc. that a person, an animal or a plant will have.

In sexually reproducing organisms, the gametes undergo meiosis, and hence, each gamete contains only half a 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 the progeny.