Question

Which parent determines eye colour?

Answer 1

The sum of all biological mechanisms by which certain features are passed down from parents to their offspring is known as heredity. The genotype of an organism is the collection of genes that an offspring gets from both parents, which is a combination of each parent's genetic material.

Complete answer:
In general, children receive their eye colour from their parents, which is a mix of Mom and Dad's eye colours. The parents' eye colour and whether the parents' genes are dominant or recessive genes determine the baby's eye colour. Newborns tend to resemble their mother more than their father.

Variations in a person's genes determine eye colour. The majority of genes linked to eye colour are involved in the generation, transport, or storage of melanin, a pigment. The amount and grade of melanin in the anterior layers of the iris is directly related to eye colour.
Both the parents determine equally for the eye color of the their children.

Both the parents determine equally for the eye color of the their children. Children's eye colour is determined by genetic features passed down from their parents.

The inheritance pattern for eye colour is complicated due to the large number of genes involved. Although the colour of a child's eyes may normally be predicted by looking at the colour of his or her parents' eyes, the polymorphisms that can occur imply that a child's eye colour may be unexpected.

The pairing of genes passed down from each parent determines a child's eye colour, which is thought to entail at least three gene pairs. EYCL1 (also known as the gey gene) and EYCL3 are the two key gene pairs that geneticists have focused on (also called the bey2 gene).

Alleles are the different variations of a gene. Green eyes are caused by one allele of the gey gene, while blue eyes are caused by another allele. One allele of the bey2 gene is responsible for brown eyes, whereas the other is responsible for blue eyes. The gene for brown eyes is the most dominant and is always dominant over the other two alleles, while the allele for green eyes is always dominant over the recessive allele for blue eyes. This means that parents with the same eye colour can yet have a child with different eye colour.

For instance, if two brown-eyed parents each passed on a pair of blue alleles to their child, the youngster would be born with blue eyes. If one of the parents passed down a green allele, the child would have green eyes, and if a brown allele was passed down, the child would have brown eyes, regardless of the other three alleles.

This, however, does not explain how a child with brown eyes can be born to two blue-eyed parents. It also doesn't explain why some people have grey or hazel eyes. This is where modifier genes, other genes linked to eye colour, and mutations come into play, as they can all contribute to eye colour variation. Scientists are currently trying to figure out how these other elements contribute to such differences.

Note: It is conceivable for blue-eyed parents to have a brown-eyed child, albeit it is uncommon. Brown and maybe green are dominant colours, but even two browns can produce a blue-eyed child because there are no absolute laws, so you can only go by a percentage.