Human and chimpanzee genomes share 96% DNA sequence identity. What most likely causes humans to be
phenotypically distinct from chimpanzees?
a. the presence of many new genes unique to humans
b. a much larger human genome compared to the chimpanzee genome
c. the loss of higher functioning genes in chimpanzees
d. dramatic changes in chromosome structure and organization in humans
e. small mutations in protein coding sequences and changes in regulatory units of human genes
ANSWER: e
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