Lesson 2 - Homologous Limbs 

Lesson Objectives

A.  Content Objective:  The pentadactyl limb is an example of adaptive radiation and provides evidence for a common ancestor.

B.  Language Objective: Explain how the pentadactyl limb structure is related to different methods of locomotion.

C.  Syllabus Statements:​

• Evolution of homologous structures by adaptive radiation explains similarities in structure when there are differences in function.

• Application: Comparison of the pentadactyl limb of mammals, birds, amphibians and reptiles with different methods of locomotion.

Activites

Activity 1  - Evolution Video - Tetrapod Limbs

Activity 2  - Homologous Structure Activity

Click here for the activity

Link to figure 1

Home Learning

A. Strengthen Your Skills

 Bioninja - Adaptive Radiation and the Pentadactyl Limb

Understanding Evolution - Adaptive Radiation

 B.  Expand Your Knowledge

How do you change limbs?  Change gene expression