The categories are; autosomal recessive, autosomal dominant and sex-linked. Autosomal' refers to mutations affecting the non-sex chromosomes (1-22). Where as sex-linked defects arise from mutations which occur on the sex chromosomes. Autosomal conditions affect males and females at equal frequencies, where as sex-linked conditions affect the sexes differently. ... An example of each of a single gene defect has been chosen for each of the categories of; autosomal recessive and dominant and sex-linked. ...

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