Sex-linked Traits (Genetics question)?

Some traits are sex-linked. In other words, they are affected by the y-chromosome i.e. hemophilia.





Given that for women:


H_ = normal


hh = hemophilic





and for men:


Hy = normal


hy = hemophilic





And that another trait, such as colorblindness:





For women:


C_ = normal


cc = colorblind





For men:


Cy = normal


cy = colorblind





Is it possible to have a person with the genotype Hycy? Although it makes the person a non-hemophilic colorblind, the person would have two y-chromsomes, right?





Or is the y simply a y-chromosome allele?





Just wondering how this works out.

Sex-linked Traits (Genetics question)?
More than one gene can be located on a chromosome. It is entirely possible for more than one coding sequence of DNA to be located on the y chromosome.
Reply:It is possible because although both chromosomes are linked to the Y chromosome, that does not automatically mean they are linked to each other. So, for a non-hemophilic colourblind male, he would be XY and the Y would carry the gene for colourblindness.
Reply:the y is a y chromosome allele and the trait is linked to the x chromosome so there is an x and a y there
Reply:the latter.


cant have 2 y-chromosomes.