Bio T3 Sex -linked genetic diseases

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  • Sex linked genetic disorders
    • Characteristic is sex-linked if allele that codes for it is located on sex chromosomes (x or y)
    • Girls have ** Boys have XY  Only boys have y chromosome often have 1 allele for sex-linked genes
      • Boys only have 1 allele so characteristic of this allele expressed even if recessive, men more likely to have sex- linked genetic diseases (usually recessive) as there is nothing to dominate recessive allele
    • Caused by faulty alleles on sex chromosomes
    • Y chromosome is shorter than x chromosome so carries fewer genes, most genes on x
      • Girls have ** Boys have XY  Only boys have y chromosome often have 1 allele for sex-linked genes
        • Boys only have 1 allele so characteristic of this allele expressed even if recessive, men more likely to have sex- linked genetic diseases (usually recessive) as there is nothing to dominate recessive allele

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