Genetics: X-linked Inheritance & Multiple Allelism

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X-linked inheritance

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Gene located on X chromosome

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Hemizygous

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Males with one X chromosome

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X-linked recessive

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Expressed in males, females need two copies

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X-linked dominant

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Expressed with one copy in both sexes

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Color blindness

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Common X-linked recessive trait

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Multiple allelism

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More than two alleles for a gene

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ABO blood group

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Example of multiple allelism

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Allele

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Different forms of a gene

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Codominance

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Both alleles expressed equally

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Carrier female

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Heterozygous for X-linked trait