Representing Human Traits

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I'm confused on when to use a two capital letters, two lowercase letters or one of each. This is for traits. We just started it in Biology. It has something to do with heterozygous and homozygous dominant and homozygous recessive and so on.

For example Pp PP pp I don't know when to use which one.

  • Representing Human Traits -

    Capitals (upper case letters) are used to indicate dominant genes, while lower case letters are used for recessive genes.

    PP = homozygous dominant
    Pp = heterozygous, but dominant determines phenotype trait
    pp = homozygous recessive

    I hope this helps. Thanks for asking.

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