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In an Analysis of DNA Sequence Evolution in a Single

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In an analysis of DNA sequence evolution in a single gene in multiple vertebrate species, a researcher divides the data into two classes: differences among species at the first and second positions in codons, and differences among species at the third positions in codons. When the researcher plots the results, below, she finds that she has two different molecular clocks. Explain the researcher's findings. In an analysis of DNA sequence evolution in a single gene in multiple vertebrate species, a researcher divides the data into two classes: differences among species at the first and second positions in codons, and differences among species at the third positions in codons. When the researcher plots the results, below, she finds that she has two different molecular clocks. Explain the researcher's findings.

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It seems that selection is operating, to...

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