Brown eyes are the <u>dominant human trait</u> that the person acquired from either of their parents. The <u>offspring receive half of their genes from the father and another half from the mother.
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Further Explanation:
The <u>color of the eye depends on the </u><u>variation</u> in the gene of the person’s. The genes that are responsible for eye color helps in the formation, transport, and storage of a melanin pigment. The color of the eye is directly proportional to the amount of melanin present in the front layer of the iris. The individual with a brown eye has a large quantity of melanin.
A <u>specific region of the chromosome 15 </u>plays a crucial role. The two genes present in the region helps in maturation and storage of melanin. <u>These genes are OCA2 (P-protein) and HERC2</u>. OCA2 helps in the maturation of the melanosomes that synthesis and store the melanin pigment. Therefore, the lesser the quantity of P-protein means the lesser quantity of melanin present in the iris.
HERC2 gene also known as intron 86 regulates the activity of the OCA2 gene. The polymorphism in this gene leads to a reduction in the expression of the OCA2 gene. It results in the production of less amount of melanin.
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Answer Details:
Grade: High School
Subjects: Biology
Topic: Cancer.
Keywords:
Eye, variation, gene, formation, transport, melanin, pigment, iris, chromosome, maturation, protein, melanosomes, polymorphism, expression.
