SIGN IN   Advanced Search

Browse Biotechnology
Possible Models for DNA Replication

Three possible ways in which DNA can replicate are illustrated. The two original strands of DNA are shown in yellow (light); newly synthesized DNA is blue (dark). To explain the phenomenon of heredity, biological information must be accurately copied and transmitted from each cell to all of its progeny. Three ways for DNA molecules to replicate may be considered, each obeying the rules of complementary base pairing. Conservative replication would leave intact the original DNA molecule and generate a completely new molecule. Dispersive replication would produce two DNA molecules with sections of both old and new DNA interspersed along each strand. Semiconservative replication would produce molecules with both old and new DNA, but each molecule would be composed of one old strand and one new one. The replication is semiconservative. Each strand acts as a template for the synthesis of a new DNA molecule by the sequential addition of complementary base pairs, thereby generating a new DNA strand that is the complementary sequence to the parental DNA. Each daughter DNA molecule ends up with one of the original strands and one newly synthesized strand.

Rate this Resource:
1 = not useful, 5 = very useful

Please be the first to rate this resource.

View Free


Resource Type: Diagram
Audience Level: High school lower division 9-10, High school upper division 11-12, Undergraduate lower division 13-14

Author and Copyright

Authors and Editors: Access Excellence, Access Excellence @ the National Health Museum
Publisher: Access Excellence @ the National Health Museum
Format: text/html
Copyright and other restrictions: Yes
Cost: No


» Sign In or register to post comments.

National Health Museum-Access Excellence



Triple A S National Science Foundation Naitonal Science Digital Library Pathway
Funded by the individual BEN Collaborators and grants from the
National Science Foundation [DUE 0085840 / DUE 0226185 / DUE 0532797 / DUE 0734995]

This website is a National Science Digital Library (NSDL) Pathway.
Copyright © 2019. American Association for the Advancement of Science. All Rights Reserved.