There is a difference of only one amino acid in one chain of the hemoglobin of humans and gorillas. what might have caused this difference?

If the two amino acids are comparable in polarity, then i do no longer think of it would make a difference. The fold of the protein (in accordance with polarity) may well be very comparable. If the replace grew to become right into a nonpolar and polar diffrence, then you definately ought to discover why this alteration is so considerable. it would even have been a mutation interior the DNA whilst that specie grew to become into merely commencing as much as conform. That mutation might have been handed down. good success.