Ask an geneticist science

When I was done looking at the three links, I learned that chimps and humans started out with exactly the same chromosomes 5 million years ago. I also learned that male chromosomes are XY and female is XX. The facts that I discovered is that the chimps and humans are 98.8% same as us and 1.2% different! Also that if we had one pair of chromosomes we would only have 4 combinations of sex cells. This is what I learned from the 3 links.