human can breed with each other between negroid, caucasoid, mongoloid, and australoid, and create fertile and healthy offsprings, which mean human still same species maybe different sub-species.genetic has the same ''assumption'' case as the archaeology does, genetics cannot solve crap until and unless we have the genetic data from archaeology itself which will be impossible esp for the regions like india, one may get it from artics but not damp and humid places like india.
archaeology does show the possibility of multiple case of independent modern humans and their cultures have affinities across the world.
the thing about australian and indian connection is a pseudo science as well, that thing has been debunked few years ago. probably the assumption is based on some superficial resemblence with tamil population with the australian aboriginal.
the western geneticists seem to be concocting few stuff based on their assumptions as well, collecting data and manipulating them according to their wishes, all their conclusions have also been challenged.
why does ''aryan migration genetics'' not proved through the anthropological studies conducted on the harappan skeletal remains?
people making genetic conclusions are doing confirmation bias nothing else.
genetic research is also at its very infancy.
different species can forced breeding but will create steril offspring like horse with donkey, lion with tiger, etc.