Human and chimpanzee share most of their nucleotide sequence yet exhibit significant phenotypic differences.What is likely to be the most important sequence differences between these two species?

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Regulatory sequences, such as enhancers and promoters, control the timing and levels of gene expression. Differences in these sequences can result in significant phenotypic differences between closely related species, even if the structural genes are highly similar.

Human and Chimpanzee Share Most of Their Nucleotide Sequence Yet