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This is so that, when an egg and a sperm meet during conception, the child that is produced also has 46 chromosomes in each cell.
New body cells are produced for growth and repair by cells dividing, producing two 'daughter' cells.
Chromosomes are found in the centre (nucleus) of a cell.Each cell of your body contains chromosomes which are made up of many genes.In general, each cell in your body contains 46 chromosomes arranged in 23 pairs.The other 22 pairs of chromosomes are numbered according to size with 1 being the longest pair and 22 being the shortest pair of chromosomes.However, egg and sperm cells only have 23 chromosomes (1 chromosme from each pair).
However, affected babies and children may need a great deal of physiotherapy and speech and language therapy.