The main genetic difference between chimpanzees and humans is the number of chromosomes. Humans have 23 pairs of chromosomes whereas chimpanzee have 24 pairs of chromosomes in their genomes. The human genome contains 46 chromosomes while chimp genome contains 48 chromosomes. Humans and chimpanzees have 1.2% of non-coding DNA difference in their genomes that are responsible for all the unmatching characteristics of humans and chimpanzees. The size of the human and chimpanzee genome is similar, they have about 66% gene duplications in both genomes and 29% of the human and chimpanzee orthologous proteins are also very similar.
Comments
suggestion
The reader may not know the difference between genomes and chromosomes so I would be more specific and add some details. Also, avoid the word "very", as it does not add much value to your writing.
suggestion
You begin most of your sentences with "the" maybe don't use that word so often.
Suggestion
I would re-read your paragraph to make sure it has proper flow/specific words. For example, in the sentence "Humans and chimpanzees have 1.2% of non-coding DNA difference in their genomes that are responsible for all the unmatching characteristics of humans and chimpanzees" I would use the word "between" instead of "of" after characteristics. It would read better.