Chapter 14 Outline
I. Developing a Theory of Evolution
Evolutionary theory is a collection of carefully reasoned and tested hypotheses about how evolutionary change occurs.
A. An Early Explanation for Evolutionary Change
1. Jean Baptiste de Lamarck (1744-1829)-one of the first scientists to recognize that living things changed over time. Also realized that organisms were somehow adapted to their environments. Lamarck relied on three assumptions, that we now know are wrong.
a. DESIRE TO CHANGE-thought that organisms change because that have an inborn urge to better themselves and become more fit to their environment.
b. USE and DISUSE- thought that changed occurred because organisms could alter their shape by using their bodies in new ways.
c. PASSING on ACQUIRED TRAITS-thought that characteristics were inherited.
B. Ideas That Shaped Darwins Theory of Evolution