2006-09-12 08:59:04 · 16 answers · asked by Anonymous in Science & Mathematics ➔ Biology
Yes, a person can carry a trait without expressing it. This is called dominance. If both parents carry the trait for blue eyes, a child can have blue eyes, but only if they both carry it. Blue eyes are recessive so If they received a blue eye gene from one parent and a brown from another, the brown would be dominant. If both parents carry the gene for blue eyes, the child has a 1 in 4 chance of having blue eyes.
2006-09-12 09:06:22 · answer #1 · answered by Anonymous · 1⤊ 0⤋
Yes. This happens when both parents are heterzygous dominate for brown eyes. This means your parents have a dominante allele for brown eyes, "B" and a recessive allele for blue eyes "b". So, if you were making a punnit square, both parents would look like Bb. When you cross them there is a 1 in 4 chance that the alleles will combine to make a bb, which is blue eyes. Blue eyes is only expressed when a person has both alleles for it because it is a recessive trait.
mother B b
Father B BB Bb
b Bb bb
Hope this helps!
2006-09-12 09:22:48 · answer #2 · answered by natureutt78 4 · 0⤊ 0⤋
Yes this can happen. It can be explained by genetics.
Humans have 3 eye color genes. Two of these genes are named bey2 (brown eye) and gey (green eye). Both bey2 and gey have alleles: brown and blue & green and blue, respectively. The brown allele is dominant over blue. Also the green allele is dominant over the blue. Alleles are present on chromosomes in pairs. Thus the alleles of the bey2 will be Brown-Brown, brown-blue and blue-blue. If 2 people with the brown-blue alleles were to marry, then they could produce a blue eyed child with a 1:4 chance, that is 1 in 4 children that they produce would be blue eyed.
2006-09-12 09:20:43 · answer #3 · answered by snehas 1 · 0⤊ 0⤋
Yes, It can happen.......All you have to know are your grandparents eyecolors on both sides, and then your parents. You can set up a gene table all by your self and figure the probability of which color you will have......If brown is predominant through both generations there is a possibility that further back there were other carriers, or it could just be a recessive trait that has been passed constantly but never carried. My Husband has blue eyes, his mother had brown and father had blue.....I have brown and both my parents had brown, one set of g'parents had brown the other set had blue and green.....My son wound up with Green and hazel eyes.....see? just make a table and you'll understand
2006-09-12 09:17:46 · answer #4 · answered by arielchrisandjunior 2 · 0⤊ 0⤋
Yes; blue eyes are a recessive trait; therefore, if both parents are heterozygous (that is, they each have one allele for blue eyes and one allele for brown eyes), they themselves will have brown eyes (brown being dominant), but if both of them pass the blue allele on to their offspring, the child will have blue eyes. This will happen on average 1/4 of the time. Please note that not ALL brown-eyed individuals are carrying the blue-eyed gene, only some.
2006-09-12 09:05:42 · answer #5 · answered by astazangasta 5 · 1⤊ 0⤋
Everybody has two sets of genes, inherited from each parent. If both parents have dominant brown eyes then you know that if you get the brown gene for one or both, your eyes will be brown. If both parents are hiding a recessive blue gene and they both give it to you, then you will have blue eyes.
2006-09-12 09:04:35 · answer #6 · answered by Amphibolite 7 · 1⤊ 0⤋
Yes. The brown-eyed gene is dominant, it overrides the blue-eyed gene, so if both parents have one brown and one blue gene, they will have brown eyes, but could possibly each pass on their own blue-eyed gene to their child, which would then have blue eyes. It isn't possible the other way around, though, as you can see. Two blue eyed parents can't have a brown-eyed child.
2006-09-12 09:07:56 · answer #7 · answered by The Resurrectionist 6 · 0⤊ 0⤋
yes
if both parents are heterozygous for the blue eye gene. Brown eyes is dominant over blue eyes. If your parents have a brown eye gene from grandma (B) and a blue eye gene from grandpa (b) they can pass on the (b) to you. However to have blue eyes you must get the recessive blue eye gene from both parents.
2006-09-12 09:04:09 · answer #8 · answered by pecora2404 2 · 3⤊ 0⤋
Yes, if both parents are heterozygous (Bb) then they both carry the recessive gene (b) for blue eyes even though their eyes are brown. There is a 25% chance that their child will have blue eyes (bb).
2006-09-12 09:04:30 · answer #9 · answered by Rahab 2 · 3⤊ 0⤋
It may be possible if both parents have the brown eye trait that is Bb.
2006-09-12 09:04:39 · answer #10 · answered by cmp8423 3 · 0⤊ 0⤋