Genetics Question?

Question

What are the chances of a baby having blue eyes or blonde hair in a Japanese/Caucasian heritage if the Caucasian person has blue eyes and blonde hair naturally?

Also the Caucasian's person's parents had blue eyes and hazel/brown eyes.

Also one grandparent (on the Caucasian side) would be a brunette and the other a baby blonde which later turned to a reddish brown.

Answer 1

ZERO if the Japanese person does not also carry genes for blue eyes or blonde hair. Those are both recessive genes, meaning that the child MUST inherit it from BOTH parents. If one parent passes on genes for blue eyes and blonde hair but the other parent passes on genes for brown hair and brown eyes, the children will all have brown eyes and brown hair. The dominant genes rule.

Everybody has 2 genes for eye color and hair color. One from mom and one from dad. IF the genes from each parent are for the same color, then that is the color eyes or hair the child will have. If the genes passed on from the 2 parents are for 2 different colors (one color from mom and one from dad), then the child will have the eye or hair color of the dominant gene, but be a carrier for the other color that they could in turn pass on to their own kids. Now, that being said..........

Example: You have brown eyes, which means you have at least one gene for brown eyes. It is possible the other gene for eye color you carry could be for a different color, like blue.............

Your spouse has blue eyes. Blue eyes are recessive. A person MUST have BOTH of their genes for eye color to be for blue eyes. IF they carry a gene for blue eyes and a gene for another color, the other color will be dominant, and they will have that eye color, but still be a carrier for blue that they can pass on to their kid.

IF BOTH you and your spouse carry a recessive gene for blue eyes, AND BOTH of you pass on that gene to you child, then your child will have blue eyes.

That is a lot of big "IF's". You cannot predict this if you do not know what other genes the person with brown eyes carry. You MAY possibly be able to figure that out though, IF that person has a parent that has blue eyes. If the person who has brown eyes does not have a parent with blue eyes, then you will never know without DNA testing if you carry a gene for blue eyes you could pass on --- unless you have a child that has blue eyes. Then you know that BOTH you and your spouse carry genes for blue eyes, as that is the only way the child could have blue eyes.

Very confusing, I know. But that is how it goes. There is not a real simple, elementary answer to genetics.

Answer 2

25% chance of blonde hair and a separate 25% chance of blue eyes.

The odds of having both in the same child are 6.25% (.25 x .25).

The person above who says to ignore the recessive gene hype isn't far off. A recessive gene can always appear in a child as a dominant trait. I actually know a whole family of Japanese-Americans with red hair because the red hair gene took over. There were blue-eyed babies born in VietNam to Vietnamese mothers who slept with blue-eyed Americans. Recessive genes don't disappear. There's always a 1:4 chance of one recessive gene appearing in any child and a 1:16 chance of two recessive genes appearing in a child.

Answer 3

Never mind all the hype about recessive genes and whatnot; it is a slim chance, but possible, as it has happened so many times throughout the world.

Answer 4

I would think slim, since blue eyes would be the submissive gene, and i would think that blone hair would also be a submissive gene