In my (albeit basic) biology classes in the past, we've learned about how, to reproduce, two organisms must have the same number of chromosomes. This has been verified by a few other websites I found. So- I've heard about various genetic disorders in which people can have fewer or more chromosomes than usual. For example, if a person had tetrasomy, they would have two extra chromosomes (48 in total). Chimpanzees also have 48. Therefore:
If, hypothetically, a person with tetrasomy and a chimp's sex cells were combined, would it create anything?
If not, what are the other requirements for creating a baby organism besides the parents having the same number of chromosomes?