Question:

Suppose that the allele for brown eyes (B)is dominant to the allele for hazel eyes (b). ?

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If both parents have brown eyes and are heterozygous (Bb), what are the chances that their first child will have hazel eyes? brown eyes? What are the chances that if they have children, both will have hazel eyes?

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  1. What you do is make a chart like this:

          B      b

    B   BB   Bb

    b   bB    bb

    The B is the dominant trait and b is the recessive trait.  With this chart you can see that it is more likely that a child will have brown eyes and only a slight chance that they will be born with hazel eyes.


  2. 75% chance a kid will have brown eyes and a 25% chance they will have hazel eyes.

  3. This is very easy if you know how to make Punnet Squares:)

    First child:

    Brown=3/4 or 75%

    hazel=1/4 or 25%

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