Question

Which best describes how DNA is used as a molecular clock?

The number of mutations in DNA is compared between two species.

The total amount of DNA is compared between two species.

The percent of carbon in DNA is compared between parent and offspring.

The total mass of DNA is compared between parent and offspring.

Answer 1

can anyone please help me!

Answer 2

3
\

Answer 3

thasts wat i thinlk

Answer 4

Biology is certainly not my strong area....

but I did find this quote from the berkley website:

"Over the course of millions of years, mutations may build up in any given stretch of DNA at a reliable rate. For example, the gene that codes for the protein alpha-globin (a component of hemoglobin) experiences base changes at a rate of .56 changes per base pair per billion years*. If this rate is reliable, the gene could be used as a molecular clock."

So it looks to me that the answer is number 1

SOURCE:- http://evolution.berkeley.edu/evosite/evo101/IIE1cMolecularclocks.shtml