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Chromosomes and genes

Chromosomes, found in the cell nucleus, contain many genes. A gene is a section of DNA, which carries coding for a particular protein. Different genes control the development of different characteristics of an organism. Many genes are needed to carry all the genetic information for a whole organism.

chromosome, showing gene as section of DNA (http://www.bbc.co.uk/schools/gcsebitesize/science/images/cell_chrom_dna.jpg)

The number of genes and chromosomes


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