Since brown eyes are dominant(my dad),why do 3 siblings have blue eyes?

Question

My Mom has blue eyes

Answer 1

From what I learned in high school, the eye color gene is a duel gene, where there are two parts, for example, BB. Each person has two parts. As you've said, the brown-eyed gene is dominant, here, we'll say big B. The blue-eyed gene is recessive, here, we'll say small b. Because we have two, the combination can be BB, Bb, bB or bb. If there is a big B, then the person has brown eyes. Only if there is bb does the person have blue eyes. If both parents have both genes (bB or Bb), then the kids have a one in four chance of having blue eyes. Because your mother has blue eyes, she has bb, and your father has one of the others. Logically, he must have Bb or bB.
B b
b Bb bb
b Bb bb
There is a 50% chance that a child will have blue eyes.

Answer 2

Because dominant genes don't determine how all children will look. The genetic code of an unborn child is basically a roll of the dice. Both parents may have brown eyes but also possess the recessive gene for blue eyes, and in that situation it is entirely possible that all children will be born blue-eyed. Dominant genes only matter if you inherit them.

Answer 3

Each person carries 2 genes to determine what color eyes they have. If they have brown eyes, because brown is a dominent gene, the other gene they carry can be for a recessive color, such as blue. Your dad must have a recessive blue eye gene. Since you're mom has blue eyes, which is recessive, she's only carrying blue eye genes. Each parent passes along one gene. Your siblings, who have blue eyes, received a blue gene from your dad instead of the brown gene.

Answer 4

When a trait is a dominant trait, then a person who SHOWS the dominant trait might CARRY the recessive trait.

If the gene for blue eyes is symbolized by "b," and the gene for brown eyes is symbolized by "B," then someone with brown eyes could have either a "Bb" or a BB" genetic conformation.

If your dad is a "Bb," and your mom is a "bb," then statistically half of all of their children will have blue eyes.

Answer 5

It's all about genetics. Since brown eyes are dominant on your dad's side, I would have to say many of your ancestors had blue eye dominantcy too. Let's talk about my family for instance. My dad had brown eyes and my mother had hazel eyes. My 2 older sisters have brown eyes, but my brother and I have blue eyes. My mother's mom (my grandma) had blue eyes and her mother's mother (my great grandma) had blue eyes. My dad's mother had blue eyes and his grandma (my great grandma) had blue eyes and so did my dad's grandpa (my great grandpa).

So you see, when it comes to genetics, you don't always get the hair color or color of eyes or looks from your parents, it goes back much further.

Good luck and I hope I was some what helpful!

Answer 6

Blue eyes are recessive. this suggests all diverse colored eyes are dominant, so if a gene for the a number of color is handed down, the teen gained't have blue eyes. the mummy for optimistic has 2 blue eye genes (one presented through using each and each and each and each determine) and for this reason blue eyes. this suggests she will be able to bypass a blue eye gene to the teen. What we can't comprehend is even if or no longer the daddy possesses the blue eye gene. for optimistic he has a brown eye gene yet would have the blue eyed one to boot (if both of his mothers and fathers had blue eyes then he will own that gene). So it extremely comes all the way right down to what the daddy passes on. If he passes on a blue eye gene the little you would have blue eyes. If he passes on a brown eye gene (or a eco-friendly or hazel or the a number of recessive gene he would have) then the baby receives its eye color from him.

Answer 7

It all depends, since genetics are a coin toss. My eyes are brown and my husband's blue, and my son's eyes are blue too. I'm the only brown haired brown eyed person in my household, even though my sister, dad and mom all have dark hair. Mom & sis have brown eyes, while dad has hazel

Answer 8

Your father obviously carries the recessive blue-eye genes. I have blue eyes and both parents have brown eyes.

Answer 9

because both of your parents carry the blue gene. your mother has 2 blue genes, your father a blue and a brown. Because he has a brown gene, his eyes are brown. but your siblings probably got 2 blue genes, one from your father, one from your mother. thus, blue eyes.

Answer 10

Your dad also carried a nondominent gene, enabling your siblings to be able to inherit an eye color other than brown, there's a 50% chance of having brown eyes among you and your siblings