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Eye colour change?
My eyes are dark brown. My mothers entire family has dark brown eyes. My father's family has dark brown, green, and dark grey eyes. My father's eyes change colour over time. What are the chances of this happening to me? My sister's child has light eyes. Both her parents have dark brown eyes. What are the chances of my child having light eyes, when I have one?
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What colour eyes does her partner have? When determining eye colour, there is this thing called the mendel or 'punnet' square. On the top line you write the eye colour of your parents and on the vertical far left side you write your partners parents' eyecolours.
| Brown| blue <-Your parents eye colour
|______|______
Brown| BB | Bb
| |
blue | Bb | bb
I hope they shows up on the answer properly. If not, here is an example that looks the same as mine but refers to pollen and plants.
[Link](Mouse over link to see full location)
So the top horizontal line is your parents eye colour (it's just an example) and the vertical far left side is your partners parents' eye colour. The big B represents brown. Brown is a dominant eye colour. The little b represents blue, which is a recessive gene (the non-dominant gene). You match each up to the opposite (Brown to brown, brown to blue. Blue to brown, blue to blue.) and recieve these initials. Each initial is a one out of 4 chance. The BB, Bb and Bb all determine that the childs eye colour would turn brown as it has the domininant brown gene. The bb means that there are two recessive genes which would mean the less dominant (blue colour) would appear in the child. So here, your child would have a 1/4 chance of having blue eyes, but a 3/4 chance of having brown.
It is very likely that your children will have brown eyes as brown is the dominiant gene unless they recieve the rare recessive green eye dna strand. The likelihood is also increased if your partner has ligher eyes. The green eye and grey eye genes are in your dna, but it is rare for it to come out in your children. I think my old science teacher once said that these things can sometimes skip a generation, which would make sense as to why your sister's child has light eyes. It's sort of like when two brown haired parents have a red headed child, that child just recieved the recessive read haired gene from an ancestor.
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Well the chances are 50/50. Usually guys get traits from their fathers more than girls do, but sometimes its the different. So if your a girl you have a chance but if your a guy, you have a greater chance.
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