Question

What is the significance of Meselson and Stahl’s experiment?

Answer 1

The Meselson-Stahl experiment validated Watson and Crick’s notion that DNA replication was semi-conservative. The two new molecules include one strand of new and one strand of old material.

The researcher’s explanation of DNA replication provides a physical basis for hereditary diseases and how organisms maintain and transfer genetic information to their offspring.

Based on the result, Meselson and Stahl made three conclusions:

1. The two DNA subunits share each DNA molecule equally, and the subunits remained intact during the replication cycles that were observed.
2. When a parent transmits a single subunit of DNA to their offspring, half of the parent’s DNA is maintained in the offspring’s DNA and the other half is not.
3. Two new DNA molecules were created for each parental DNA molecule. Consequently, with each replication, the amount of DNA rose by a factor of two.