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Differences in iris color have been attributed to such causes as the temperature of the brain and eyes. Some people have stressed differences between dark-eyed and light-eyed populations and have suggested that eye color is related to general traits such as temperament or intellect. But, toward the middle of the nineteenth century, it had become clear that iris color was due to iris pigment, that this pigment developed soon after birth, and that the final quantity and distribution of the pigment was a hereditary trait.
Originally, iris color was thought to be a simple trait—one governed by a single gene with multiple forms, or alleles, corresponding to each color. In this scheme, blue was thought to be recessive, requiring two copies of the blue allele in order to be displayed. Therefore, two blue-eyed parents could have only blue-eyed children, since each parent had only blue alleles. However, repeated observation of brown-eyed offspring from two blue-eyed parents showed this view to be wrong. Iris color is likely to be a polygenic trait—one governed by at least two genes and possibly more.
Brown versus blue eye color is believed to be controlled by two genes on chromosome 15, called BEY1 and BEY2. Green versus blue eye color is believed to be controlled by a gene on chromosome 15, called GEY. In this system, blue is believed to be recessive to both brown and green. The protein products of these genes are unknown, however, as is the number of alleles possible for each. Furthermore, these three do not fully explain inheritance of all eye colors. More genes, which likely modify the action of these three, are probably involved.
The last thing to keep in mind is I'm not a geneticist
Originally posted by calstorm
Its not uncommon at all for 1 brown eyed parent to and one blue eyed parent to have a blue eyed baby. I can think of tons of people this as happened to. What I found odd is the high rate of 2 brown eyed parents having blue eyed children.
Originally posted by DragonsDemesne
From what I understand, brown eyes are a dominant gene, so it is likely that the mother cheated with a blue-eyed man, but it is not guaranteed. I'm not sure what the actual statistics would be. However, the very fact that blue-eyed people still exist must mean that it is possible in this given scenario for the baby to be blue-eyed and the father be brown-eyed.
The other thing to keep in mind is that I've also read that some babies are born with lighter coloured eyes like blue, but as they get older, the eyes gradually darken, so don't jump to conclusions too early.
The last thing to keep in mind is I'm not a geneticist :p But from things I remember reading, my words are correct to the best of my knowledge.
Originally posted by sirnex
Say a blue eyed mother and a (possible) brown eyed "father" had a baby and the baby came out blue eyed, what are the chances of the brown eyed father being the actual father of the baby?
Originally posted by sirnex
Say a blue eyed mother and a (possible) blue eyed "father" had a baby and the baby came out blue eyed but a brown eyed man thinks he is the father and the blue eyed baby 'smells right' to the (possible) blue eyed "father", which is most likely the real father?
what are the chances of the brown eyed
father being the actual father of the baby?
what are the chances of the brown eyed father being the actual father of the baby?
Both of my parents (biological) had brown eyes. My brother and I (same parents) both have blue eyes. My son has blue eyes, and his father has brown eyes, but again; my eyes are blue.
A brown eyed father and a blue eyed mother could very easily have a blue eyed baby. Because the brown eyed father could have recessive blue eyed genes. (Over simplified on purpose)
The blue eyed father and the brown eyed father have about the same chance based on eye color alone. If the blue eyed father has a very good sense of smell, it is possible that he is picking up on something else, but I dont know any science on that.