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Obviously, the only way for one to be male is to inherit the Y chromosome, but are there alleles on the y chromosomes? Or is it just automatically the recessive trait without an allele.
The questionare there alleles on the y chromosomesis unclear. Here are two possible things you might mean
- Is there genetic variation among individuals on the y chromosomes
- Is there anything functional on the Y chromosome
Is there genetic variation among individuals on the y chromosomes
Yes, of course, there is genetic variation of the Y chromosome just like there is genetic variation other chromosomes. Talking about SNPs (Single Nucleotide Polymorphism) only, we have already detected tens of thousands of SNPs on the Y chromosome (see this page).
Is there anything functional on the Y chromosome
Yes! As an example, one of the most famous gene on the Y chromosome is the Test determination factor (as already indicated in a comment by @L.Diagio).
