Comparative Similarity of DNA among Species
Human
Human
99.9 %
Human
Chimp
96 %
Human
Cat
90 %
Human
Mouse
85 %
Human
Cow
80 %
Human
Fruit Fly
61 %
Human
Chicken
60 %
Human
Banana 60 %



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     Most of the similarity is due to Housekeeping Genes that are required to maintain
     basic cellular function in all cell types of an organism,  thus a difference of
     1 base pair per 1,000 bases pairs makes us different.      
  What makes us Human?