Evolution Lab Essay

767 Words May 2nd, 2013 4 Pages
Name _____________________________ Regents Biology

Period _________ Date ______________________

LAB ____. ANATOMICAL EVIDENCE OF EVOLUTION In our studies of the anatomy and development of animals we have discovered that many living creatures that look quite different on the surface have similarities underneath their skin that suggest that they are related to each other. This is evidence that living creatures have evolved, or gradually changed over time. In this lab, you will learn about homologous, analogous, and vestigial structures and their value as evidence for evolution.

INSTRUCTIONS A. HOMOLOGOUS STRUCTURES
There are many examples of body structures that are formed in similar ways during embryonic development and that share
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In some cases, these changes have reduced or removed the function of some body parts and organs. These reduced or lost structures are called vestigial structures. The wings of penguins and the leg bones of snakes are examples of this phenomenon. 1. Observe the drawings of the cavefish and the minnow shown in Figure 3. The fish are related to each other but the cave fish is blind and only has the remnants of an eye. 2.

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