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Two alleles are responsible for determining both eye color and hair color. The allele for brown hair is dominant over the allele for blonde hair. The allele for brown eyes is dominant over the allele for blue eyes.

If the organism presents with the dominant allele it can either be homozygous or heterozygous. But if it presents with either blonde hair and/or blue eyes it is homozygous for the recessivge alleles.

Hazel, green and brown are all mutations of eye color but from the same allele that is responsible for brown eyes - so with the alleles there are really only to classes of eye color brown and blue - and if your not blue eyed your under brown eyes.

Letting; H = brown hair and h = blonde hair and E = brown eyes and e = blue eyes

Mother Blonde = hh Hazel = EE/Ee

Father Brown = HH/Hh Brown = EE/Ee

I assume the grandparents are from the mothers side because 2 natural blondes should only have blonde children naturally.

1/4 chance of baby being blonde 1/12 will have blue eyes

Another answerIt's very possible that a child could have red hair also with those genes. I have many family members that have a red headed child.
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Q: What color eyes and hair will a baby have if mother has blonde hair hazel eyes father has dark brown hair brown eyes grandmother has blonde hair green eyes and grandfather has blonde hair hazel eyes?
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