Which Kind of DNA Should Provide the Best Molecular Clock

question 8

Multiple Choice

Which kind of DNA should provide the best molecular clock for determining the evolutionary relatedness of several species whose common ancestor became extinct billions of years ago?

• A)DNA coding for ribosomal RNA
• B)intronic DNA belonging to a gene whose product performs a crucial function
• C)paralogous DNA that has lost its function (that is,no longer codes for functional gene product)
• D)mitochondrial DNA
• E)exonic DNA that codes for a noncrucial part of a polypeptide

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