Why are men colorblind but women are not?

Answer 1

Women can be colorblind too but it is more common in men. The reason is that it is carried on the X chromasome. So, a woman needs two colorblind X genes to be colorblind, but a man only needs 1 because he only has 1 X chromasome and 1 Y. If a woman has 1 colorblind X and 1 non-colorblind X, she will not be colorblind because it is a recessive trait.

Answer 2

Colorblindness is caused by an X-linked recessive gene. Since males only have a single x chromosome, they will have a much higher chance of being colorblind.

Women can be colorblind, but only if their father was colorblind AND their mother was either a carrier of colorblindness or was also colorblind.

Answer 3

It is possible for a woman to be colorblind, just not nearly as common as a man. The gene for colorblindness is located on the X Chromosome. Since men only have one X chromosome, they only need to inherit the gene from one parent. A woman with colorblindness would have to inherit it from BOTH parents!

Answer 4

Because genetically, females cannot get it because of chromosomes and herditary genetics. Here I pasted this from a site:

Men are mainly affected because women have two X chromosomes and men have only one X and a Y chromosome. If a man's one X chromosome is color defective he will be color deficient, where as , a woman must inherit two color defective X chromosomes to be color deficient. For a woman to be color deficient, her father must be colorblind and her mother colorblind or be a carrier. All possible patterns of inheritance of any one of these color defects are shown here:

Well there ya go- have a nice day ^_^

Answer 5

I think they are both colorblind, women just have good fashion taste. True some men do.

Answer 6

I know some colorblind women.

Answer 7

I'm colorblind, but I have met a colorblind woman also.

Answer 8

letter D for sure. The female would give the colorblindness to her sons. Her daughters would be carriers for CB, but not have it.

Answer 9

First, women can also be color blind, but not as likely.

There are many types of color blindness. The most common are hereditary (genetic) photoreceptor disorders, but it is also possible to acquire color blindness through damage to the retina, optic nerve, or higher brain areas. Higher brain areas implicated in color processing include the parvocellular pathway of the lateral geniculate nucleus of the thalamus, and visual area V4 of the visual cortex. Acquired color blindness is generally unlike the more typical genetic disorders. For example, it is possible to acquire color blindness only in a portion of the visual field but maintain normal color vision elsewhere. Some forms of acquired color blindness are reversible. Transient color blindness also occurs (very rarely) in the aura of some migraine sufferers.

Genetic red-green color blindness affects men much more often than women, because the genes for the red and green color receptors are located on the X chromosome, of which men have only one and women have two. Such a trait is called sex-linked. Genetic females (46, XX) are red-green color blind only if both their X chromosomes are defective with a similar deficiency, whereas genetic males (46, XY) are color blind if their only X chromosome is defective.

The gene for red-green color blindness is transmitted from a color blind male to all his daughters who are heterozygote carriers and are perceptually unaffected. In turn, a carrier woman passes on a mutated X chromosome region to only half her male offspring. The sons of an affected male will not inherit the trait, since they receive his Y chromosome and not his (defective) X chromosome.

Because one X chromosome is inactivated at random in each cell during a woman's development, it is possible for her to have four different cone types, as when a carrier of protanomaly has a child with a deuteranomalic man. Denoting the normal vision alleles by P and D and the anomalous by p and d, the carrier is PD pD and the man is Pd. The daughter is either PD Pd or pD Pd. Suppose she is pD Pd. Each cell in her body expresses either her mother's chromosome pD or her father's Pd. Thus her red-green sensing will involve both the normal and the anomalous pigments for both colors. Such women are tetrachromats, since they require a mixture of four spectral lights to match an arbitrary light.

Answer 10

I don't know what makes people color blind ....