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How can two brown eyed parents have a blue eyed baby especially when the baby has three brown eyed grandparents and one blue eyed grandparent?
Wiki User
∙ 15y ago
The following is excerpted from a report I did my freshman year of high school on the genetics of various traits. Please note that all of the information is adapted from the related links below. The fourth link has helpful diagrams.
The genetics of eye color are very complicated! The color of a person's eyes is determined by the amount of pigment-producing proteins there are in the eye and how well they work. There are two different colored pigments: black and yellow. These pigments are melanin. Different combinations of these two colors of melanin produce different eye colors. More protein produces brown eyes, while less of it will produce green and blue eyes. Now, here's where genes come into play. Multiple genes are needed to make the different colored pigments. Also, in 2006, researchers from Queensland, Australia found something called "single nucleotide polymorphisms" (SNPs) that can vary bases in DNA structure that can change hair or eye color. SNPs can be found near a gene known as OCA2. This gene produces protein that causes different colors in hair, eyes, and skin. The combination of SNPs have a strong influence on a person's eye color. SNPs will affect the amount of pigmentation protein made, which affects eye color. As I stated before, this is very complicated. So, I will simplify things. There are two different loci involved. A locus, as defined by MSN Encarta, is "the position of a gene on a chromosome." One locus has B alleles. A capital B is the dominant allele, meaning that the person with this allele will have brown eyes, no matter what other alleles that person has at their other locus. A lowercase b is recessive, meaning blue eyes. For a person to have blue eyes, their genotype must be completely recessive, meaning that the alleles on the other locus must also be recessive. Speaking of the alleles on the other locus, a capital Gwithout a capital B will typically yield a person with green or hazel eyes. The genotypes of offspring can be determined using two-factor crosses. (See example of two heterozygous parents below.) However, eye color is more than just this, so blue eyed people can have brown eyed children, but this example certainly simplifies things!
Wiki User
∙ 15y ago
Wiki User
∙ 13y agoYes ... both of my parents have brown eyes and me and my sisters eyes are greenish-blue :)
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Can a baby have blue eyes if both parents have brown eyes and grandparents on one side have blue and brown and on the other side have green and brown?
yes, although the likely hood chance is that it will have brown eyes as both of the parents do.
What color will the baby's hair be if the father has brown hair and the mother has brown hair?
It's impossible to tell, becaue it depends on the genetic make-up of both parents, since you get your color-genes from your grandparents (and then it's passed on through your parents).
Why do you have brown eyes when both your mother and father have blue eyes?
There had to be blue eyes within your genealogy. You need two recessive genes to produce blue eyes. Still, the bottom line is, it is very possible. There are individuals in my family that have blue eyes with parents that have brown eyes.
Can both parents with blue eyes have a child with brown eyes?
Not necessarily. A pair of blue-eyed parents may have a brown-eyed child. This is because there is more than one gene involved in eye-color determination. Please see the thorough explanation in the links.
What does a baby look like if mother is brown and dad is light skin?
Almost all brown people are born with light complextions, the color of any offspring can be determined by the adult parent's coloring without a suntan. That being said, you now have a dark brown father and a light brown mother... the baby will most likely be anywhere between the shades of the two parents. There is a decent chance the baby can be lighter or darker, maybe a throwback to its grandparents. Are the parents of differing ethnicities? How did this question come about?
Can a caramel colored woman and light skinned man make a light skinned baby?
The short anser is yes. The longer is: A lot depends on the genes of the parents. The genes of the grandparents can have an influence. For example: if both parents have blue eyes but a grandparent has brown eyes, the baby can have brown eyes.
If mother born with blonde hair now has very dark brown hair her parents had black light brown hair. Father has dirty blondesandy brown hair and freckles. What is the chance of a red head baby?
Does anyone on either side of the family have red hair? If your grandparent - or your baby's father - had a grandparent with red hair the baby could have it. You have to look farther back than just your parents & his parents.
Why do African kids have blue eyes when their parents have black or brown eyes?
Someone in the family had blue eyes, like a grandparent.
Can a baby have blue eyes if both parents have brown eyes and grandparents on one side have blue and brown and on the other side have green and brown?
yes, although the likely hood chance is that it will have brown eyes as both of the parents do.
Can a baby be blonde if her parents have brown hair?
Yes. Especially since the genetics aren't just from the parents. Grandparents and great grandparents also play a part of the puzzle. Also, keep in mind the hair color changes. A baby that might be blond now may end up having dark hair later in life.
Can parents with black hair produce a baby with brown hair?
Sure, both of my grandparents had black hair and they had six children, about half had brown.
If you have a child with reddish brown hair but the parents are brown and black headed with blue and brown eyes how can the child have red in his hair?
......... Perhaps the grandparents have red hair. LOok up- dominant and recessive traits.
What color will the baby's hair be if the father has brown hair and the mother has brown hair?
It's impossible to tell, becaue it depends on the genetic make-up of both parents, since you get your color-genes from your grandparents (and then it's passed on through your parents).
Is is possible for two brown eyed parents to have a blue eyed baby if three of the grandparents are brown eyed?
Yes, because brown eyes are the dominate trait, blue eyes might be the "hidden trait." one of the grandparents have the hidden trait, they passed it onto the parent, and the the blue eyes trait became dominate in the child.
Can a brown eyed woman and brown eyed man make a blue eyed child?
Yes, as long as one of their Grandparents/ Great Grandparents has blue eyes. If both pairs of Grandparents have brown eyes then it is VERY unlikely :)
What color do you get baby chihuahuas if there parents are brown and tan?
Its impossible to tell, since you first have to find out what colors their other ancestors were, like the grandparents, the great grandparents, even the great great grandparents, and out of all those colors, that's a possibility of what color the baby chihuahuas will be. its all in genetics
Can a blue eyed dad and a grey eyed mom make a brown eyed baby?
both of my grandparents had blue eyes, but my mom has brown eyes. and my dad has blue eyes, but my eyes are green. anything is possible. plus, science and genes aren't perfect. nobody can say exactly how a person is going to look just based on parents. you have to consider your grandparents, great grandparents, great great grandparents, and so on. ALL of your ancestors have played a role in your genes.
