CBSE Class 10 Science 2015 Term II Outside Delhi Set 1

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Question : 12
Total: 36
What are chromosomes ? Explain how in sexually reproducing organisms the number of chromosomes in the progeny is maintained.
Solution:  
Chromosomes are thread like structures made up of DNA found in the nucleus.
The original number of chromosomes becomes half during gamete formation.
Hence, when the gametes combine, the original number of chromosomes gets restored in the progeny.
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