NEET BIOLOGY

Detailed explanation-1: -Eye color is determined by variations in a person’s genes. Most of the genes associated with eye color are involved in the production, transport, or storage of a pigment called melanin. Eye color is directly related to the amount of melanin in the front layers of the iris.

Detailed explanation-2: -Genetic determination of eye color It is now clear that eye color is a polygenic trait, meaning it is determined by multiple genes. Among the genes that affect eye color, OCA2 and HERC2 stand out. Both are located on human chromosome 15.

Detailed explanation-3: -Polygenic inheritance is the quantitative inheritance in which multiple independent genes have an additive or similar effect on a single quantitative trait. In polygenic inheritance has multiple genes which produce an equal effect. Example: Skin color, height of a person, eye color, hair color.

Detailed explanation-4: -Eye colour, or more correctly iris colour, is often used as an example for teaching Mendelian genetics, with brown being dominant and blue being recessive.

Detailed explanation-5: -Eye color was traditionally described as a single gene trait, with brown eyes being dominant over blue eyes. Today, scientists have discovered that at least eight genes influence the final color of eyes. The genes control the amount of melanin inside specialized cells of the iris.