There are many chromosomes linked to colour blindness. If you are reading a really old text book or your teacher is a fossil and hasn't done any work since the 60's then they will say that colour blindness is linked to the sex chromosomes. More men than women have Red-Green colour blindness as the "dodgy" copy of the gene is on the X chromosome which males only get one copy of. Females have two X chromosomes and so are more likely to get at least one "good" copy of the gene. Yawn, this is a lie, well its outdated science which is just as bad.
Currently around half the human chromosomes linked to colour blindness in one way or another.
Sex linked
For example, if a mother is a carrier for colorblindness (X+Xc), and a father has normal vision X+Y, then their sons have a 50% chance of colorblindness because they inherit their X chromosome from their mother and their Y chromosome from their father.
Traits like colorblindness, hemophilia, and Duchenne muscular dystrophy are carried on the X chromosome. These traits are caused by mutations in specific genes located on the X chromosome, such as the OPN1LW and OPN1MW genes for colorblindness and the F8 and F9 genes for hemophilia.
Human being is the best example for this type of inheritance because the gene responsible for colorblindness is present on the X chromosome. Thus a heterozygous female is the carrier of colorblindness and some of the sons from this mother receiving the X chromosome with a gene for colorblindness will be colorblind because in males the other sex chromosome is Y, which remains neutral for such genes.
Why is colorblindness a sex-linked trait? Descendants of colorblind hemophiliac man both disease are sex- linked? why do non of the children have either hemophila or colorblind
it is a genetic trait carried on the X chromosome. Males have only one X chromosome, while females have two. If a male inherits the colorblindness gene on his one X chromosome, he will have the condition. However, females would need to inherit the gene on both X chromosomes to be colorblind.
Color blindness is sex linked.
Yes. Because the colorblind trait is a sexlinked trait and is found in the X chromosome that is inherited from the mother, men that only have one X chromosome will develop colorblindness if the trait is found in this gene. For a woman to get it, she would need to have the colorblind gene on both x chromosomes. Therefore the girl´s dad would have to be colorblind and the mother at least a carrier.
He will always be colorblind in that case because the defective gene is carried on the "X" chromosome, which males only have one of. You see, the colorblindness gene is recessive, which means if it is paired with a regular color seeing gene it is hidden, and the person can still see the difference between red and green. Because males have only one "X" chromosome, if they get the colorblindness gene from their mother, it will always lead to colorblindness. Side note: Males cannot receive the colorblindness gene from their Father, as he cannot give a "X" chromosome to his son. If he did, his son would be a daughter.
Yes. It is a sex-linked recessive trait found on the X chromosome.
With sex linked traits (the allele is found on the X chromosome) males are either affected or not (they have the defective allele or they don't). Women have two copies of the allele and can be a carrier.
Yes. Two normal-visioned parents can produce a color blind child only if both the parents have are heterozygous. To determine the phenotypes of the parents, you will have to look at their parents.