An Example
The following is an example for eye color.Human eye color is governed by three genes, EYCL1 (gey), EYCL2 (bey1), and EYCL3 (bey2)... The 'gey' locus determines green-blue color (green is dominant over blue). 'bey1' is the central brown locus, and 'bey2' determines brown-blue color (brown dominant over blue). Not much is known about the function of 'bey1', so I'll describe the probability in terms of the 'gey' and 'bey2' loci only...
Assuming that the genotypes are as follows:
Your father: bey2,Bb;gey,?g
Your mother: bey2,Bb;gey,GG
You: bey2,bb;gey,Gg
Husband's father: bey2,Bb;gey,?g
Husband's mother: bey2,Bb;gey,?(g)
Husband: bey2,bb;gey,Gg
So, if we cross you and your husband:
bey2,bb;gey,Gg x bey2,bb;gey,Gg
We will get the following distribution:
bey2,bb;gey,GG 4
bey2,bb;gey,Gg 8
bey2,bb;gey,gg 4
Therefore, there is a 25% chance that your child will have green eyes, a 50% that she will have hazel eyes, and a 25% chance that she will have blue eyes.. If the genotypes are correct, there is no chance your child will have brown eyes.
I'm sure that clears things up.
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