Dominant and recessive alleles?

If two people, one with green eyes and one with blue have a child how do you determine what the color could be, since they are both recessive?

2 Answers

  • Caitie
    Lv 7
    8 years ago
    Favorite Answer

    You really can't. Human eye color requires more than one set of alleles, called a multigenic trait. Blue eyes are more common than green, but the mixture of alleles someone will inherit from these two parents is difficult to predict. This is not about a single dominant or recessive allele. If it were, we'd only have brown and blue eyes, which of course we do not.

    Any alleles for color on the iris will dominate over blue, but again, this is a multigenic trait. Even people with blue eyes in the same family can have different shades of blue, depending on the other alleles for eye color they inherit. Some may have dark blue eyes, others bright blue eyes, so even among blue eyes there is variation.

    In short, this is not a Punnet square question. Human eye color is very complex.

    Source(s): masters, human physiology; retired AP biology, physiology teacher
  • Aileen
    Lv 5
    8 years ago

    There is a 50/50 percent chance that their child will have blue or green eyes (Homozygous and Heterozygous).

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