what exactly DNA, gene , choromosome 

and what is relation between these three

DNA :- DNA stands for Deoxyribonucleic acid. DNA is a hereditary unit of the cell which contains information for development and functioning of the organism. 

Gene:- A segment of  DNA which codes for a protein is known as gene. 

Chromosome:- DNA and some basic proteins called histones form structure called chromosome

In the nucleus of a cell thread like structures known as chromosomes are present which contains DNA and genes. 

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