question: How I have a blue eyed child when eye have brown eyes and my husband has hazel eyes.
comment: You both have the recessive gene for blue eyes. In your case, brown is the dominant trait overriding the blue eyes. You each only passed on the recessive trait to your kid leading to blue eyes.
passages: It is fairly common for mammalian eyes to change color in the first years of life. This happens, with human infants and kittens being some well-known examples, because the eyes of the baby, just like the rest of its body, are still developing. This change can be as simple as blue to brown, or can involve multiple color changes in which neither the child's parents nor his/her doctors know when the changes will stop and what the final eye color will be.
   Most new-born babies who have European ancestry have light-colored eyes. As the child develops, melanocytes (cells found within the iris of human eyes, as well as skin and hair follicles) slowly begin to produce melanin. Because melanocyte cells continually produce pigment, in theory eye color can be changed. Adult eye color is usually established between 3 and 6 months of age, though this can be later. Observing the iris of an infant from the side using only transmitted light with no reflection from the back of the iris, it is possible to detect the presence or absence of low levels of melanin. An iris that appears blue under this method of observation is more likely to remain blue as the infant ages. An iris that appears golden contains some melanin even at this early age and is likely to turn from blue to green or brown as the infant ages.
   White babies are usually born blue-eyed since there is no pigment in the stroma, and their eyes appear blue due to scattering and selective absorption from the posterior epithelium. If melanin is deposited substantially, there will be brown or black color, if not, they will remain blue or gray.
  
  All the contributing factors towards eye color and its variation are not fully understood. Autosomal recessive/dominant traits in iris color are inherent in other species but coloration can follow a different pattern.
  
  Section::::Eye color.:Genetic and physical factors determining iris color.:Amber eyes.
   In humans, the inheritance pattern followed by blue eyes is considered similar to that of a recessive trait (in general, eye color inheritance is considered a polygenic trait, meaning that it is controlled by the interactions of several genes, not just one). In 2008, new research tracked down a single genetic mutation that leads to blue eyes. "Originally, we all had brown eyes," said Eiberg. Eiberg and colleagues suggested in a study published in "Human Genetics" that a mutation in the 86th intron of the "HERC2" gene, which is hypothesized to interact with the "OCA2" gene promoter, reduced expression of "OCA2" with subsequent reduction in melanin production. The authors suggest that the mutation may have arisen in the northwestern part of the Black Sea region, and add that it is "difficult to calculate the age of the mutation." 
   Dolls came as boys or girls, with four different skin tones: American pale (with a green heart on the bottom), Australian/European peach, African-American and Hispanic. 
  
  Eye color varies too. All African-American and Hispanic dolls had brown eyes (Hispanic dolls eyes have orange rays above their pupils). The other dolls had blue, aqua, green or brown eyes. Occasionally a doll can be found with a factory "flaw" and their eye color can vary from the standard, for example hazel, lilac, blue-gray or blue-green. However, some people attribute this to aging rather than to a factory flaw.
   The eyes of an adult champagne horse are most often described as hazel or amber. In the newborn or very young foal, the eyes are bright blue to blue-green and the skin is bright pink. The champagne blue foal eye is creamier than other types of blue eye such as the bright, unpigmented blue seen on some pinto horses.
   Changes in eye color signal changes in the arrangement and concentration of pigment in the iris, which is an example of structural color. Even though this change happens after birth, it is strictly as result of genes. While changes in eye appearance (and function, and structure) that occur because of acquired characteristics like injury, illness, old age, or malnutrition are definitely acquired characteristics, the infantile color change as described above is "usually" considered inherited.
  
  Section::::Disputes.:Certain genetic conditions.
   There are many other possible reasons for having two different-colored eyes. For example, the film actor Lee Van Cleef was born with one blue eye and one green eye, a trait that reportedly was common in his family, suggesting that it was a genetic trait. This anomaly, which film producers thought would be disturbing to film audiences, was "corrected" by having Van Cleef wear brown contact lenses. David Bowie, on the other hand, had the appearance of different eye colors due to an injury that caused one pupil to be permanently dilated.
   Section::::Genetic determination.
   Section::::Early life.
   Changes (lightening or darkening) of eye colors during early childhood, puberty, pregnancy, and sometimes after serious trauma (like heterochromia) do represent cause for a plausible argument stating that some eyes can or do change, based on chemical reactions and hormonal changes within the body.
  
  Studies on Caucasian twins, both fraternal and identical, have shown that eye color over time can be subject to change, and major demelanization of the iris may also be genetically determined. Most eye-color changes have been observed or reported in the Caucasian population with hazel and amber eyes.
  
  Section::::Eye color chart (Martin scale).
   Many traits are inherited in a more complicated way than the example above. This can happen when there are several genes involved, each contributing a small part to the end result. Tall people tend to have tall children because their children get a package of many alleles that each contribute a bit to how much they grow. However, there are not clear groups of "short people" and "tall people", like there are groups of people with brown or red hair. This is because of the large number of genes involved; this makes the trait very variable and people are of many different heights. Despite a common misconception, the green/blue eye traits are also inherited in this complex inheritance model. Inheritance can also be complicated when the trait depends on interaction between genetics and environment. For example, malnutrition does not change traits like eye color, but can stunt growth.
   He visited the oldest daughter, and her husband went fishing out in a dough trough. He asked his wife whether his eyes were green yet, and when they were, he jumped in and fished. The father lost three bags of gold this time.
   Mixture of light eyes (blue, gray or green) with brown when light and brown appearance is at the same level.
  
  Dark and dark-mixed eyes (6–1 in Martin scale)
  
  BULLET::::- Dark-mixed: 6–5 in Martin scale. Brown with small admixture of light
  
  BULLET::::- Dark: 4–1 in Martin scale. Brown (light brown and dark brown) and very dark brown (almost black)
  
  Section::::Eye color chart (Martin scale).:Amber.
   Definitions of the eye color "hazel" vary: it is sometimes considered to be synonymous with light brown or gold, as in the color of a hazelnut shell.
  
  Hazel eyes occur throughout Caucasoid populations, in particular in regions where blue, green and brown eyed peoples are intermixed.
  
  Section::::Eye color chart (Martin scale).:Red and violet.
   The gene "OCA2" (), when in a variant form, causes the pink eye color and hypopigmentation common in human albinism. (The name of the gene is derived from the disorder it causes, oculocutaneous albinism type II.) Different SNPs within "OCA2" are strongly associated with blue and green eyes as well as variations in freckling, mole counts, hair and skin tone. The polymorphisms may be in an "OCA2" regulatory sequence, where they may influence the expression of the gene product, which in turn affects pigmentation. A specific mutation within the "HERC2" gene, a gene that regulates "OCA2" expression, is partly responsible for blue eyes. Other genes implicated in eye color variation are SLC24A4 and TYR. A 2010 study on eye color variation into hue and saturation values using high-resolution digital full-eye photographs found three new loci for a total of ten genes, and now about 50% of eye colour variation can be explained.
   They are waiting for Pauline's son Jack who is just over an hour late to be home from work. They talk about how he is known as “the smartest and finest looking black boy in the whole town.” They discuss how he is the only one in the family with blue eyes, while everyone else has black eyes. Rebecca claims she wishes she had his eyes too, and Pauline discourages her from ignoring her own beauty. They make fun of how dedicated and hard working Jack is, saying instead of chasing girls he is more interested in his books.
   In a 2004 Country Music Television interview, Gayle stated that Leigh wrote the song because his dog had one brown eye and one blue eye.
  
  Section::::Critical reception.
   The brightly colored eyes of many bird species result from the presence of other pigments, such as pteridines, purines, and carotenoids. Humans and other animals have many phenotypic variations in eye color. The genetics of eye color are complicated, and color is determined by multiple genes. So far, as many as 15 genes have been associated with eye color inheritance. Some of the eye-color genes include "OCA2" and "HERC2". The earlier belief that blue eye color is a simple recessive trait has been shown to be incorrect. The genetics of eye color are so complex that almost any parent-child combination of eye colors can occur. However, OCA2 gene polymorphism, close to proximal 5′ regulatory region, explains most human eye-color variation.
   In this example, both parents have the genotype "Bb". For the example of eye color, this would mean they both have brown eyes. They can produce gametes that contain either the "B" or the "b" allele. (It is conventional in genetics to use capital letters to indicate dominant alleles and lower-case letters to indicate recessive alleles.) The probability of an individual offspring's having the genotype "BB" is 25%, "Bb" is 50%, and "bb" is 25%. The ratio of the phenotypes is 3:1, typical for a monohybrid cross. When assessing phenotype from this, "3" of the offspring have "Brown" eyes and only one offspring has "green" eyes. (3 are "B_" and 1 is "bb")
   Blue eyes with a brown spot, green eyes, and gray eyes are caused by an entirely different part of the genome.
  
  Section::::Ancient DNA and eye color in Europe.
   Light or medium-pigmented brown eyes can also be commonly found in South Europe, among the Americas, and parts of Central Asia (Middle East and South Asia).
  
  Section::::Eye color chart (Martin scale).:Gray.
   Section::::Early life.
   They are most common in Northern, Western and Central Europe. In Ireland and Scotland 14% of people have brown eyes and 86% have either blue or green eyes, In Iceland, 89% of women and 87% of men have either blue or green eye color. A study of Icelandic and Dutch adults found green eyes to be much more prevalent in women than in men. Among European Americans, green eyes are most common among those of recent Celtic and Germanic ancestry, about 16%. 37.2% of Italians from Verona and 56% of Slovenes have blue/green eyes.
   Homozygous cream dilutes, sometimes called double-dilutes, always have light blue eyes to match their pale, cream-colored coats. Heterozygous or single-dilute creams, such as palominos and buckskins, often have light brown eyes. The eyes of horses with the Champagne gene are typically greenish shades: aqua at birth, darkening to hazel with maturity.
  
  As in humans, much of the genetics and etiology behind eye color are not yet fully understood.
  
  Section::::The anatomy of the equine eye.:The adnexa.
  
presuppositions: Brown eyed parents only carry brown eyed gene. 
corrections: Both brown eyed parents carry the recessive gene for blue eyes, and each parent passed the recessive gene to the child.
raw_presuppositions: Brown eyed parents only carry brown eyed gene.  If neither parent has blue eyes then the child can't have blue eyes.
raw_corrections: Both brown eyed parents carry the recessive gene for blue eyes, and each parent passed the recessive gene to the child. Both parents can carry the recessive gene for blue eyes, which is passed on to the kid.