Red-green color weakness is caused by
A)changes in the optic nerve pathways.
B)changes in the genes which control the pigments in the rods.
C)a recessive, sex-lined trait carried on the Y chromosome.
D)a recessive, sex-linked trait carried on the X chromosome.

Question

Quizplus · Accepted Answer

Red-green color weakness is a type of color vision deficiency that is inherited as a recessive, sex-linked trait carried on the X chromosome. This means that the gene responsible for producing the pigments that allow individuals to see red and green colors is located on the X chromosome. Males have only one X chromosome, so if this chromosome carries the gene for red-green color weakness, they will experience the condition. Females have two X chromosomes, so they may have one normal copy and one copy with the gene for red-green color weakness, making them carriers of the trait.

Red-Green Color Weakness Is Caused by