Is color blindness a sex linked disease?

Answer 1

Yes. A person is color blind if all his or her X chromosomes have the defective gene. A man have one X chromosome, and a woman has two. Thus:

If only the father is color blind

- The probability that the son is color blind is 0%

- The probability that the daughter is color blind is 0%

- The probability that the daughter is a bearer of the defective gene is 100%

If the mother is a bearer of the defective gene, but is not color blind, and the father is not color blind

- The probability that the son is color blind is 50%

- The probability that the daughter is color blind is 0%

- The probability that the daughter is a bearer of the defective gene is 50%

If the mother is a bearer of the defective gene but not color blind, and the father is color blind

- The probability that the son is color blind is 50%

- The probability that the daughter is color blind is 50%

- The probability that the daughter is a bearer of the defective gene is 100%

If the mother is color blind and the father is not

- The probability that the son is color blind is 100%

- The probability that the daughter is color blind is 0%

- The probability that the daughter is a bearer of the defective gene is 100%

If both parents are color blind

- The probability that the child, regardless of gender, is color blind is 100%

Answer 2

Humans are a diploid (2n) organism, which means 23 pairs of chromosomes for a total of 46. 22 of these pairs are autosomes, or homologous chromosomes, with 1 being contributed by each parent. The 23rd pair consists of the sex chromosomes, X or Y, with the mother always contributing an X and the father's sperm determining the sex of the baby with either an X or Y. Under most circumstances, the possibilities are either XX (girl) or XY (boy).

The gene for the trait of red-green colorblindness codes on the X chromosome only and is referred to as X-linked. Fortunately, this X-linked trait (along with others like hemophilia) is recessive, or else there would be a high probability of large populations of humans who are red-green colorblind.

However, there is one caveat, boys receive only 1 X chromosome (from their mother), which means for them it makes no difference whether the trait is dominant or recessive because if the gene is present, then it will be expressed.

Here are the possibilities:

If the mother is colorblind (both X's contain the gene), then all of her sons will be colorblind regardless of the father (remember the father contributes the Y). If the father is colorblind, then her daughters will also be colorblind; and if the father is not colorblind, then her daughters will be carriers (only 1 of their X's will contain the gene).

If the mother is not colorblind, but is a carrier, then her sons will have a 50% chance of being colorblind regardless of the father. If the father is colorblind, then her daughters will also have a 50% chance of being colorblind; otherwise, they will be a carrier. If the father is not colorblind, then the daughters have only a 50% chance of being a carrier.

If the mother is not colorblind, and is not a carrier, then her sons will not inherit the trait, regardless of the father. If the father is colorblind, then the daughters have only a 50% chance of being colorblind. Obviously, if neither parent is colorblind, nor a carrier, then children will have no chance of inheriting the gene.

To further understand these probabilities, I suggest drawing a Punnett Square.

Answer 3

No, actually it is a completely normal function of the brain. You see you brain can interpret a color as red while mine says its green, but it doesnt matter since we both have been told that it is red. Children learn to recognize colors in their environment at a young age and are then taught which colors are which. The brains of people who are "color blind" are simply struggling to recognize certain colors. No, acctually it isa chromosomal abnormality, it affects 9 different ones mostly in the X chromosome

Answer 4

No, colorblindness cannot be observed in a person's karyotype. Colorblindness is gene-related, and is in no way influenced by the number of chromosomes a person has, or the deformities of those chromosomes.

Answer 5

No, color blindness is due to a recessive allele present on the X chromosome, but not on the Y. This explains why there is a significantly larger amount of its incidence in males (XY) versus females (XX). Males only need to carry one allele for the condition, whereas it must be present on both X chromosomes in females in order for it to show.

Answer 6

The gene responsible for the blue receptors is found on chromosome 7 - which is evenly distributed among males and females.

The sex-linked forms of colour blindness have genes located on the X chromosome (meaning males are more likely to be affected than females).

Answer 7

the monkey will not be strongly affected

Answer 8

Because it only happens to males.

Answer 9

yes