Does anyone know or can solve the chromosomes mystery?

Human has 46 chromosomes, but chimpanzees have 48 chromosomes. did the "common ancestor" have 48? or 46? or 47? or?

i wonder who did "observing" these 2 details or same blind faith as some religions
i wonder who did "observing" these 2 details or same blind faith as some religions

any guesses? or suggestions?

Updates
+1 y
"possible mechanisms for the inactivation" of genetic material. blinder faith than some religions.
Does anyone know or can solve the chromosomes mystery?
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