on what chromosome is the gene for color blindness located? is color blindness pleiotropic or polygenic?

Answer 1

It depends. Red-green color blindness is encoded on the X sex chromosome (#23). Blue-yellow color blindness on the other side is encoded on chromosome #7. Total color blindness (rod monochromacy) either on #2 or #8; different studies showed different results (even #14 was onces located as the source of rod monochromacy).

Pleiotropic: Doesn't look like. There don't seem to be any other traits coming alongside with color blindness.
Polygenic: No. Only one chromosome holds the gene encoding each type of color blindness (see above).

Answer 2

It is a sex-linked trait. It's on the X chromosome. Since males are XY, if they have the trait on the chromosome, they will be colorblind. For women to be colorblind, they must have the trait on both of the X chromosomes. Females are XX. If only 1 X chromosome is affected, the woman will be a carrier and can pass on the trait but will not be color blind.

Answer 3

I believe that the only thing that is affected by colorblindness is the inability to distinguish certain colors, so the gene would not be considered to be plieotropic. Since it is caused by a single gene (note that there are different kinds of colorblindness that are caused by mutations in different genes), colorblindness is not polygenic.

Answer 4

color blindness is sex related and is located on sex chromosome. males are more likly to have color blindness as compared to fe-males