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 Wysłany: Czw 2:37, 10 Lut 2011 Temat postu: Genetics and Eye Color precious ghd |
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Genetics and Eye Color,[link widoczny dla zalogowanych]
Another common question is how does a baby end up with blue eyes when both parents have brown eyes.
That can happen because the gene for blue eye color is recessive,[link widoczny dla zalogowanych], which means that you need two genes for blue eyes to actually have blue eyes. On the other hand,[link widoczny dla zalogowanych], the gene for brown eyes is dominant,[link widoczny dla zalogowanych], so your friend only need one gene for brown eyes to have brown eyes. Therefore, if someone has one gene for blue eyes and one gene for brown eyes (we usually have two genes for most things like eye color, hair cut color,[link widoczny dla zalogowanych], or height, getting one from each parent),[link widoczny dla zalogowanych], the baby will have brown eyes.
But even if two parents have brown eyes, they could both have one gene for blue eyes. If they each pass this gene to their baby,[link widoczny dla zalogowanych], then the baby will have two genes for blue eyes and will actually have blue eyes.
The gene for green eyes is also dominant over blue eye color,[link widoczny dla zalogowanych], but is recessive to brown. So what new colours eyes could a baby have if one parent had green eyes and the other parent had brown eyes? Since the genetics of eye new colours is quite complex and poorly understood,[link widoczny dla zalogowanych], the real answer is that the baby could have almost any eye color from hazel to blue.
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