if only Y chromosomes are affected by the colorblindness gene, then how can women be colorblind?

Answer 1

The color blindness gene is on the X chromosome
not the Y. It is a recessive gene, but it shows up
in the male if he has it because he has only the
one X chromosome and there is no corresponding
gene on the Y to counterbalance it. A woman can
be color blind if she receives the recessive gene
from her mother (who is a carrier) and her father
is colorblind. Thus she has two of the genes for
colorblindness, one from each parent.

Answer 2

The prevalence of shade blindness in females is somewhat low, yet does happen. The genes for purple-green shade blindness are carried on the X-chromosome, meaning that adult males with the defective X chromosome would be shade blind yet a woman could have the two X chromosomes wearing the trait for shade blindness to be expressed. on the different hand, Blue-Yellow shade blindness isn't intercourse-linked. it rather is a user-friendly mutation and is expressed in men and girls the two.

Answer 3

They aren't...its a sex linked trait. The colour blindness gene is on the Y chromosome. Its recessive though, so a woman needs 2 copies in order to be colour blind (which is why its rarer in women). The gene is on the "missing" arm of the Y chromosome, so if a bloke inherits the Y chromosome with the faulty gene they're colour blind. Women are normally lucky enough to inherit at least one fully functional copy of the gene on one of their X chromosomes.

Answer 4

It isn't a y chromosome problem as you can tell. Women need the faulty gene on both their X's because it's classically recessive ; blokes only have one X so that's it.

Best of Luck - Mike

Answer 5

woman only become carrier of the disease they will not get it.