Answers

2016-03-05T14:58:30+05:30
a coiled DNA is called chromosome
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2016-03-05T15:02:01+05:30
They are the thread like structure that carry information in the form of genes.This has been achieved by having special lineages of cells in specialised organs which have only half the no of chromosomes and thus half the amount of dna. Thus when these gametes from two individual combine during sexual reproduction to form a new individual, it results in re-establishment of the no of chromosomes. 
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