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dna is the complex chemical that carries genetic information. dna is contained in chromosomes, which are found in the nucleus of most cells. the gene is the unit of inheritance and different forms of the same gene are called alleles. cystic fibrosis is an inherited disorder caused by a faulty allele. the human genome project has worked out the human dna sequence, and its data are useful for forensic science and medical research.cysgair
cysgair
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