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Dominant: upper case letter

Recessive: lower case letter

Usually the letter that is used is the first letter of the recessive trait, for instance since albinism is a recessive trait, someone who is an albino would have aa. Someone who is not would either be Aa or AA.

In other examples you use a upper case letter and a superscript letter, usually the first letter of the name. For instance daltonism, which is recessive and linked to the X chromosome, would be XDXd for a female carrier, XdXd for a daltonic female and XdY for a daltonic male.

For blood types, for type O, which is recessive, would be ii. Type A would be either IAi or IAIA. Type B would be either IBi or IBIB and type AB would be IAIB.

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