These parents had 2 green-eyed children and one brown-eyed child and I was told this is impossible. Is it?
2006-12-13 13:24:49 · 23 answers · asked by HARTaGOLD 2 in Science & Mathematics ➔ Biology
I noticed that a few of you aren't really reading the question--it's really about the brown-eyed child, not the green eyes.
2006-12-14 04:20:36 · update #1
Yes, it is possible. The parents could both have a dominant and recessive gene for this trait, but eye color is actually determined by many things unlike other traits. Usually, though, the parents would have either a homozygous dominant or heterozygous or homozygous recessive pairing and if you make a punnet square, you would see the odds for the trait. However, eye color is determined by many things and not just getting the dominant or recessive gene like most traits, but it is possible. Basically, in the case of eye color, it does not come down to dominant or recessive genes, otherwise this would be impossible because both parents would pass a recessive green eye gene down and no brown eye dominant gene could be present.
By the way, you do know that brown eye's would be dominant over green because they are darker, but as I mentioned before, a punnet square won't work for eye color because of the many factors that influence it.
2006-12-13 13:29:29 · answer #1 · answered by Adam 5 · 1⤊ 0⤋
Yes if both parents have a gene for brown eyes...
example P p
P = green eyes P PP Pp
p = brown eyes
p Pp pp
Mom's genes Pp
Dad's genes Pp
PP - green eyes
Pp - green eyes
pp - brown eyes
In small genetic display called a Punnet square you will be able to see that there is a 1 in 4 chance the parents will have a brown eyed child. The big P is the dominant gene and will show up even though there is a recessive gene (little p) there. If two recessive genes are combined, the physical trait will manifest and show whatever the gene represents, in this case, brown eyes.
2006-12-13 13:31:29 · answer #2 · answered by stefani_m2003 2 · 1⤊ 0⤋
all I know is that the brown eye gene is dominant over blue, you really have to look back on the history also. Seeing that it's two brown-eyed people, then the only chance of getting a blue eyed child would be very little, I'm just not sure where green eyes would fit in. I have no yet about other gene colors of eyes accept for Brown and Blue
2016-05-23 22:42:47 · answer #3 · answered by ? 4 · 0⤊ 0⤋
Its possible, but not likely.
At least one parent would have to have the gene for brown eyes to have a brown-eyed child.
And its possible (though not likely) for a person to have green eyes but still carry the gene for brown eyes (that gene could be turned off in the parent but be active in the child).
2006-12-13 13:29:03 · answer #4 · answered by Anonymous · 0⤊ 0⤋
This is impossible. Green eyes are a recessive trait, while brown eyes are dominant. One of the parents (or possibly the child) has contacts.
2006-12-13 13:27:08 · answer #5 · answered by Anonymous · 0⤊ 0⤋
It's possible. The parents have a recessive gene for brown eyes (making them heterozygous). The child has 1/8 chance for brown eyes.
2006-12-13 13:33:44 · answer #6 · answered by PhizZingFree 4 · 0⤊ 0⤋
i don't think so. They probably can because they can either have green-eyed kids or non green-eyed kids. but to be more specific, brown eyes? i'm not sure. I didn't do really well on the punnet square
2006-12-13 13:27:00 · answer #7 · answered by ** i Am hiS giRL ** 5 · 0⤊ 0⤋
It's possible if either of the parents have brown eyed ancestors.
2006-12-13 13:29:22 · answer #8 · answered by Anonymous · 0⤊ 0⤋
It is very possible. There could be a mutation that causes green eyes in both the sperm and egg. This is not uncommon. Many recessive genetic disorders are caused this way.
2006-12-13 16:44:50 · answer #9 · answered by Frannie 4 · 0⤊ 0⤋
Yes, recessive genes. A grandparent might have had green eyes.
2006-12-13 13:27:15 · answer #10 · answered by Aussie Chick 5 · 0⤊ 0⤋