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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).

'Genetic' means that the condition is passed on through families by special codes called genes.Each chromosome can duplicate an exact copy of itself so that each new cell that is formed has a full, identical set of chromosomes.Rarely, there is a problem with the child's chromosomes.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.

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Females have two of the same kind of sex chromosome (XX). The Y chromosome contains the male determining genes.

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