purple
Melanin.
Melanin.
It is the eye color
Eye color is polygenic and controled by 4 pairs of genes .Blue eye color is totaly recessive to all other colors .
any color humans have
It is extremely common for humans to have no earlobe to speak of . . . it is hereditary just like eye color or skin color.
Most humans will have colored eyes, the exception is albinos. Therefore the fact that two humans are twins will not stop them having colored eyes.
brown, blue, green, and hazel
I think that the difference between human eyes & dog eyes is that all dogs are color blind but not all humans are color blind. We can see in color as dogs cannot.Yes this is the maindifference but I would like two point out that through dogs are color blind that they do indeedsee in color but they are missing a type of cone that humans have and they have way less. Dogs have a lot more rods then humans.
Animals, including humans, have "rods and cones" in the eye that allow them to see color. Horses have some, but not as many as humans, so it is believed that they see color, but pastels. These colors would be associated with food, water, and blood.
Haha wow biology test questions on answers.com. MATURE! Look at the information in your packets. My friend looked up a question and this came up and it is the exact same question in the packet. Nice.