Genetics... Translocation
Can a Translocation of chromosomal parts occur between an autosome and an allosome? 


In short, yes. A quick scan of a few abstracts gives both clinical and model organism examples.


  [I]f it occurs in between allosomes,what could be the effect of Robertsonian Translocation between an X and a Y...


It seems Robertsonian translocations are not ubiquitous amongst the chromosomes and only involve 13, 14, 15, 21 and 22.

HTH.