Today, I remembered a story my uncle told me. During science one year, his class learned how two brown-eyed parents couldn't have a blue-eyed baby. After hearing this, a blue-eyed girl burst out crying. MLIA
Yep yep. I just did a Punnett square worksheet on how there IS a 25% chance of 2 brown-eyed heterozygous parents having a homozygous recessive blue-eyed baby. :D
But of course, our teacher made a worksheet with Disney characters such as Lady and the Tramp, Daisy/Donald Duck, etc. :P
Yes, I am more inclined to assume the OP messed up than that the teacher did. But even so, it is possible for two blue-eyed parents to have a brown-eyed child, just very unlikely. This is the problem with the simplified teaching of genetics, the few exceptions get concerned that they aren't related to their parents when they are. Of course, we have only fairly recently learned about genetic chimericism. (I may be spelling that wrong.)
Sorry bro, high school genetics don't exactly teach it indepth enough. "The entire Dominant/recessive (And this is the only relevant factor)" starts wearing off when you do some more genetic work.
the whole world is related bcoz everybodys ancesters are Adam and Eve so the world is family i belive this theory( ofcourse i would i made it up,but it makes sense)but i dont get y there r ppl of differnent colours like brown and white etc.
How did this ever get posted? Basic genetics, people... The allele for brown eyes is dominant to the one of blue eyes. So the parents could both have a recessive allele for blue eyes and one for brown eyes, making their phenotype brown eyes, but their genotype heterozygous.
Hopefully a color mix up in posting, otherwise gahh. Also, you guys are mostly right on the other side of things. Goldenbracelet was right with the statement that it's very unlikely for blue-eyed parents to have a brown-eyed child. It is *not* however, impossible. Blue-eyed parents can have brown-eyed children because genetics forming eye color are not as simple has having one allele dominant over the other and do not fit the rules for basic Mendelian inheritance.. Color expression is due to multiple copies of the alleles that produce the pigments brown and yellow and that exhibit different levels of penetrance. Blue eyes can be caused by low pigment levels or a defective or mutated gene for the expression of pigments. Likewise, brown eyes can occur this way. Blue-eyed parents can have green- or brown-eyed children naturally.
Phew.
This was the exact lesson I had today in biology. If both parents carry the blue eyed gene the baby can have blue eyes.
Lucky, since both my parents have brown eyes and mine are blue.
thats not true becasue blue eyes are a recessive gene so if two parents have the dominant gene Brown and the recessive gene blue then their child can have clue eyes. My sister has blue eyes and my parents both have brown eyes.
that's totally incorrect. brown is dominate, blue is recessive. if both of the parents had the brown/blue genotype then they could have a blue eyed kid.
simple biology. idiot, get your facts right.
Uh huh...I know I'm not the first to say this, but it's actually the other way around. Blue eyes are a recessive gene, so if both parents carry the gene they can have a blue-eyed baby. Brown eyes are dominant, so if the parent has genes for both colors, their eyes will be brown.
On the other hand, left-handedness is recessive, and my brother and I are right-handed whereas our parents are both left-handed. Which is impossible. We're freaks, I guess
It does, actually. As a side note, something like 80% of left-handed people had/have a twin, even if their mother doesn't know it (disappearing twin syndrome-one egg swallows the other).
Man, do they just hire anyone as science teachers these days? Blue is recessive, brown is dominant. Two brown eyed parents that have a genotype of Bb have a chance of having a blue eyed child (yes I know eye color is a little more complicated than that, but it still works out like that anyway).
someone in my bio class found out he was adopted after the teacher explained the genetics of blood types. he happened to know his and his parent`s blood type, which were incompatible. :P
that's a lie! it's just a recessive gene, both my younger brother and I have blue eyes and blond hair. Our parents are brunettes with brown and hazel eyes.
That doesn't make it that uncommon. Especially in a larger family. I have 4 siblings whom I share hoth of my parents with. It would not have been surprising if one of us had had blue eyes had both of my parents had brown eyes.
actually, eye color is made up of many genes for the single trait, and however many dominant to recessive combo is your eye color, i.e NNoo is violet :) just finished that unit in science
Yeah. I won't go all redundant - but, wow, we're supposed to be average. C's are average, and yet we all sound smart. lol just kidding. I get straight 97s and better.
I have blue eyes, both of my parents and my siblings have brown eyes. The link? My grandfather's eyes are the exact same shade of blue as mine. It's possible, just rare.
WOW OP fail, its possible for to herozygous brown eyed parents to have a blue eyed child, it is impossible for two blue eyed parents to have a brown eyed child seeing as how the trait for blue eyes is a double recessive.
There's a local African-American family whose daughters all come to my art center. The first three have milk-chocolate skin, black hair and dark brown eyes. The youngest has mocha skin, blue eyes, and BLONDE HAIR. And yes, all four girls have the same parents. How's THAT for recessive genetics?
Sign in/Register to comment.