PATHOLOGY

Detailed explanation-1: -The color of hair, skin, and eyes in animals mainly depends on the quantity, quality, and distribution of the pigment melanin, which occurs in two types: black to brown eumelanin and yellow to reddish pheomelanin.

Detailed explanation-2: -Melanin is a ubiquitous pigment generally classified as either the black-brown eumelanin or the reddish pheomelanin.

Detailed explanation-3: -In the presence of cysteine another pigment called pheomelanin can be formed that has a red-yellow color compared to eumelanin that has a brown color.