The Following Questions Refer to the Information Below -Which Kind of DNA Should Provide the Best Molecular Clock

question 17

Multiple Choice

The following questions refer to the information below.
A researcher compared the nucleotide sequences of a homologous gene from five different species of mammals with the homologous human gene. The sequence homology between each species' version of the gene and the human gene is presented as a percentage of similarity.
$$\begin{array} { l c } \text { Species } & \text { Percentage } \\\hline \text { Chimpanzee } & 99.7 \\\text { Orangutan } & 98.6 \\\text { Baboon } & 97.2 \\\text { Rhesus Monkey } & 96.9 \\\text { Rabbit } & 93.7\end{array}$$

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

• A)that 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 (i.e., no longer codes for functional gene product)
• D)mitochondrial DNA
• E)exonic DNA that codes for a non-crucial part of a polypeptide

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