What are chromosomes? Explain how in sexually reproducing organisms the number of chromosomes in the progeny is maintained.(All India - 2015)
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Answer:
Chromosomes are thread like structures, made of proteins and DNA, found in the nucleus at the time of cell division.
Explanation:
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 contain the full set of chromosomes. Hence the formation of gametes by meiosis help to maintain the number of chromosomes in the progeny
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