Is it possible for a man and a woman both with blue eyes?

Question

to have a brown eyed child? Explain in lay terms, please.

Okay, I'm thinking it's possible. Should I believe anything I was taught in biology? JK :)

Answer 1

i stand corrected (looked up answer). its rare but possible.

Eye color is an inherited trait influenced by more than one gene.[6][7] There seem to be three genotypic eye colors (brown, green, and blue) in humans.[3] Although it was once thought that brown eye color was always dominant and blue eye color was always recessive, the fact that two blue-eyed parents can give birth to a brown-eyed child has shown that the determination of eye color does not follow the simple rules of Mendelian inheritance.[6][8] Three gene pairs coding for human eye color are currently known: EYCL1, EYCL2, and EYCL3.[9][10]

http://en.wikipedia.org/wiki/Eye_color#Determination_of_eye_color
http://www.biosci.ohio-state.edu/~pfuerst/courses/eeobmg640/reading1eyecolor.pdf

Answer 2

Yes

If the man's father has a ressessive blue-eyed trait, and so does the mother, the man has a high chance (25%) to get blue eyes. Same goes with the woman.

Now the man and the woman still have the gene for the brown eyes (assuming that their parents also had that gene) and that gene could be passed down just as likely as the blue gene.



Read:
The Cartoon Guide to Genitics

Answer 3

Yes, a blue-eyed man and a blue-eyed woman can have a brown-eyed child, both biologically and through adoption. However, in neither case do the prospective parents have much say in the matter. And in case you're wondering: no, she didn't cheat on you.

Answer 4

Blue eyes are a recessive gene. Therefore, if the parents both have blue eyes, they are bbxbb, and there is no brown gene B for a baby to get.

Answer 5

Yes, it certainly is possible. The alelles for eye color are not as cut and dry as was once believed. In fact, it's been found that Mendel's inheritance patterns do not apply as well to eye color. This is due to the identification of three genes that code for eye color.

Wikipedia has a nice article on eye color, see the link below.

Answer 6

well, arguably no. blue is a recessive gene. it's never dominant. if a parent has blue eyes, he/she does not have the gene for brown eyes because if he/she did it would dominate the blue gene they do have and her/his eyes would be brown. it's possible for two parents that have brown eyes to have a blue-eyed child. eye color varies by the amount of melanin in the iris. (melanin is also responsible for skin color....).

essentially, genetically, it goes like this...every person has two genes for eye color. one from their mom and one from their dad. let's say a person has blue eyes. their eye color genes would be represented like this. bb. blue is a recessive trait so it is represented by lower case b's. that means, this person inherited the blue gene from their mom and the blue gene from their dad. having only blue genes, that's all they can pass on to their own children.

now...say a person has brown eyes. their genes could be represented like this (brown being represented by an upper case B) Bb or BB. the big B, brown, supercedes the small b, blue. the eyes would take on the color of the dominant gene. this person could have gotten a brown eyed gene from both mom and dad or from one or the other. you would have to look at what color eyes mom and dad have. if one of them has blue, you know their child must have at least one blue recessive gene. if both parents have brown eyes, you really don't know much since one or both of them could be carrying a blue recessive gene and could have passed it onto their child. that's how two parents, both with brown eyes, can have a 25% chance of having a child with blue eyes. both parents would have to have the gene type Bb and would both have to pass the blue recessive gene onto their child. the other three possibilities are......dad passes B, mom passes B; dad passes B, mom passes b; dad passes b, mom passes B. in all of THESE cases, the child would have brown eyes, the brown gene dominating the blue gene.

however....it is not quite that simple in reality and here's where i really can't help you cuz i'm not a geneticist. some people have neither brown nor blue eyes. i've heard that green eyes are actually a genetic mutation. i'm really not sure how this...or other variations of color come into play.

Answer 7

yes. if blue eyes are a dominant trait, then each parent could contribute a recessive gene for brown eyes, causing the child to have brown eyes.

Answer 8

no, blue eyes is a recessive trait, therefore to have blue eyes you must be bb and if your partner has blue eyes they are bb and when you cross the two the only possible combination is bb or blue eyes

Answer 9

yes it is possible if the grandparents or sisters or anyone in the family has brown eyes that is where the child could get it from

Answer 10

blue eyes are caused by a recessive gene. if both parents have blue eyes, the child's eye color genes are both blue, because the genes he received from his parents were both blue.