Or on the other hand perhaps the Neanderthal Y was never present in interspecies matings. Maybe it was consistently current human men who became hopelessly enamored with (or exchanged, seized or assaulted) Neanderthal ladies? Children brought into the world to these ladies would all have the H. sapiens type of the Y chromosome. In any case, it’s difficult to accommodate this thought with the observing that there is no hint of Neanderthal mitochondrial DNA (which is restricted to the female line) in current people. Or on the other hand maybe the Neanderthal Y chromosome was only not as great at is work as its H. sapiens opponent. Neanderthal populaces were in every case little, so destructive transformations would have been bound to amass. We know that Y chromosomes with an especially valuable quality (for example for more or better or quicker sperm) quickly supplant other Y chromosomes in a populace (called the drifter impact).
We additionally know the Y chromosome is corrupting generally speaking in people. It is even conceivable that SRY was lost from the Neanderthal Y, and that Neanderthals were in the problematic course of developing another sex-deciding quality, similar to certain rodents have.