Chapter 1 Adaptation by Natural Selection

Chapter 1 Adaptation by Natural Selection - Chapter 1:...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Chapter 1: Adaptation by Natural Selection Explaining Adaptation before Darwin- The human eye is a complex structure that is specifically adapted to our environment- Any substantial changes in the structure of the eye would keep the eye from functioning- During Darwin’s time, many people believed that the eye had come about by divine creation o William Paley, Natural Theology , 1802 o The structure was too complex to randomly come about through natural processes so Paley though that an intelligent creator, God, had designed the eye. Darwin’s theory of Adaptation- Darwin’s postulates: o Although adaptations are constantly expanding, there comes a point where the environment can support no more. “struggle for existence” o Organisms within populations vary, and this variation can affect the ability of the organism to survive and reproduce o This variation is passed down through generations- This process is known as natural selection or evolution by variation and selective retention- Peter and Rosemary Grant studied one species of Darwin’s finches noting their size, weight, etc. o A few years into their study, there was a drought that led to a shortage of small seeds The population decreased from 1200 to 800 • The environment could not support the population The beak size increased • Birds with bigger beaks could crack open the larger seeds that were left behind...
View Full Document

This note was uploaded on 04/21/2009 for the course ANTH 200Lg taught by Professor Yamashita during the Fall '07 term at USC.

Page1 / 5

Chapter 1 Adaptation by Natural Selection - Chapter 1:...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online