Are blue eyes biologically weaker
This is how baby's eye color develops
A few days or sometimes a few hours after birth, babies really open their eyes for the first time. Babies do not see clearly at first, but their eyes shine all the more, and in fair-skinned babies mostly blue. Dark skinned babies often have light brown or dark gray eyes initially.
When does baby's eye color begin to develop?
The actual eye color in babies does not develop until they are four months old. The actual eye color is only determined at the age of one to two years.
The dye melanin is responsible for the blue or light eyes in babies, more precisely: the non-existent dye melanin. Because this is only present in very small quantities in newborns, the iris appears blue or in dark-skinned babies light brown or dark gray. Melanin determines the later eye color in babies because it is responsible for the pigmentation of the iris (iris skin). The more melanin that is formed in the baby's first year or two, the darker the color of the eyes becomes.
In some babies - especially those who later also have brown eyes - the eyes are brown from the start.
Light eyes are more sensitive to light
The brighter the eyes are, the more sensitive they are to light. The pigmentation of the iris absorbs the sun's rays and protects the eye from too much light. People in areas with little sunlight usually have light eyes, in areas with a lot of sunlight (Africa, Asia, South America) mostly dark eyes. One therefore suspects an evolutionary biological connection.
What Affects Eye Color In Babies?
What eye color babies get later is genetically determined. So it depends on the eye color of the parents or the grandparents. Basically, dark eyes are more "dominant": If one parent has brown eyes and one parent has green eyes, the baby is likely to have brown eyes as well. If both parents have light eyes, the baby can still have brown eyes if, for example, one of the grandparents has brown eyes.
Basically: brown is the most dominant, blue is the least dominant, so it is at the bottom of the order. That is why there are less and less blue-eyed people in the world. Green (or gray) stands in between. It is more dominant than blue, but weaker than brown. Nevertheless, green or blue can prevail over brown. Blue-eyed parents can therefore have a child with brown eyes. But how does it work?
Several genes are involved in determining eye color. Exactly how many there are and what influences them is still being researched. It is assumed that every gene that determines eye color is diploid, i.e. with a double set of chromosomes. The visible eye color is the "phenotype", the eye color that has not caught on, but for which there is a predisposition, is the "genotype".
Everyone inherits genetic information for the color of their eyes from their parents. However, this does not automatically have to be the phenotype. A parent with blue eyes may as well pass brown or green eyes on to their child.
Can you predict the color of eyes in the baby?
It is not possible to predict with absolute certainty which eye color a baby will get later. The more you know about your family tree, the more accurately you can predict what eye color the baby will get later.
Based on the eye colors of parents and grandparents, certain probabilities can be calculated. However, the most common computers only work with the parents' eye colors. The results also always include whether an eye color is dominant or recessive. A baby may also have brown eyes even though both parents have blue eyes.
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