Question

What are chromosomes? Explain how the number of chromosomes is maintained in progeny during sexual reproduction?
(3 marks answer required)

Answer 1

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 ofchromosomes. ... Hence, the formation of gametes by meiosis helps tomaintain the number of chromosomesin progenies.

Answer 2

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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