How many chromosomes did Neanderthals have? And how many chromosomes did Homo Erectus have?

I know modern humans have 46, and all extant non-human apes have 48 (which I have to mention otherwise my Yahoo Answers stalker Shego will say I'm stupid and should have learned it in "high school") but did Neanderthals have 46 or 48? Did Homo Erectus have 46 or 48? Obviously this depends on when the... show more I know modern humans have 46, and all extant non-human apes have 48 (which I have to mention otherwise my Yahoo Answers stalker Shego will say I'm stupid and should have learned it in "high school") but did Neanderthals have 46 or 48? Did Homo Erectus have 46 or 48? Obviously this depends on when the chromosomes fused. If Neanderthals had 48 chromosomes, this implies our common ancestor had 48, which means the chromosomes must have fused within the last few hundred thousand years.
Update: "they evolved independently from different populations of Homo erectus"
Wrong.
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