Standard #: SC.912.L.15.2


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Discuss the use of molecular clocks to estimate how long ago various groups of organisms diverged evolutionarily from one another.


General Information

Subject Area: Science
Grade: 912
Body of Knowledge: Life Science
Standard: Diversity and Evolution of Living Organisms -

A. The scientific theory of evolution is the fundamental concept underlying all of biology.

B. The scientific theory of evolution is supported by multiple forms of scientific evidence.

C. Organisms are classified based on their evolutionary history.

D. Natural selection is a primary mechanism leading to evolutionary change.

Date Adopted or Revised: 02/08
Date of Last Rating: 05/08
Status: State Board Approved

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Related Resources

Text Resources

Name Description
Polar Bear Evolution Was Fast and Furious

This informational text resource is intended to support reading in the content area. New evidence shows that polar bears split off from their closest ancestors, brown bears, less than 500,000 years ago. This is a very short time for a large mammal to evolve. In that time, polar bears have evolved many adaptations to their specialized lifestyle, including the ability to process the large amount of fat in their seal-based diet. This is shown by their unique DNA sequence of genes related to fat processing and heart development.

Probing Question: What is a Molecular Clock?

This informational text resource is intended to support reading in the content area. The article explains what molecular clocks are and how they are used to calculate evolutionary divergence and other evolutionary events.

Tutorial

Name Description
Molecular Clock

Molecular clocks are models that use mutation rates to measure evolutionary time. Mutations tend to accumulate at a constant rate for related species. The rate of mutations is the ticking that powers a molecular clock. This tutorial will help the learners understand this concept in order to recognize how species diverge from a common ancestors.

Student Resources

Tutorial

Name Description
Molecular Clock:

Molecular clocks are models that use mutation rates to measure evolutionary time. Mutations tend to accumulate at a constant rate for related species. The rate of mutations is the ticking that powers a molecular clock. This tutorial will help the learners understand this concept in order to recognize how species diverge from a common ancestors.



Parent Resources

Tutorial

Name Description
Molecular Clock:

Molecular clocks are models that use mutation rates to measure evolutionary time. Mutations tend to accumulate at a constant rate for related species. The rate of mutations is the ticking that powers a molecular clock. This tutorial will help the learners understand this concept in order to recognize how species diverge from a common ancestors.



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