DNA (deoxyribonucleic acid) is the chemical substance that makes up our genes and chromosomes. DNA contains the genetic information that is passed from one generation to the next. The DNA molecule is in the nucleus of the cell. Chromosomes look like long threads, but they form X-shapes in cells that are about to divide. DNA consists of two long strands wound round each other in a spiral, or double helix, like a twisted ladder. The arrangement of the 'rungs make up the genetic code.
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Sunil
DNA (deoxyribonucleic acid) is the chemical substance that makes up our genes and chromosomes. DNA contains the genetic information that is passed from one generation to the next. The DNA molecule is in the nucleus of the cell. Chromosomes look like long threads, but they form X-shapes in cells that are about to divide. DNA consists of two long strands wound round each other in a spiral, or double helix, like a twisted ladder. The arrangement of the 'rungs make up the genetic code.