About 50 percent of a human being's DNA is identical to a banana's.

The DNA sequences of all living things have much in common because they
ultimately evolved from the same common ancestors. Humans, for example,
share about 50% of the same DNA sequences that occur in bananas. This is
not as surprising as it might seem at first. Both humans and bananas are
made up of relatively similar cells, with features in common, like a
nucleus, cytoplasm, mitochondria and, of course, DNA.