Chapter 17 (Part II)

Chapter 17 (Part II) - Introduction Review The role of...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter Lecture Outline Introduction How Are We Related to the Neanderthals? Review: The role of molecular biology in systematics (Chapter 12 and Module 15.12). A. Focus on the role of molecular biology in systematics. 1. Neanderthals lived in Europe until approximately 30,000 to 40,000 years ago. They had a large brain, could make tools with stone and wood, and were short in stature with heavy muscles. The Neanderthal skull (left) was markedly different from the Cro-Magnon skull (which is a direct ancestor of modern Europeans; right). 2. A question was raised recently regarding the possibility of interbreeding between Cro- Magnons and Neanderthals. To help answer the question, molecular techniques were used to sequence the DNA from a piece of Neanderthal bone. The results were compared to DNA of modern humans, regardless of location on Earth. 3. Little, if any, genetic contribution from Neanderthal to modern humans was seen in the comparison. 4. DNA from another Neanderthal bone (an infant) was analyzed, and the previous result was corroborated (no interbreeding occurred). 5. The DNA comparison was repeated with four more Neanderthal bones, and the results were the same: no similarities, no recognizable interbreeding between Cro-Magnon and Neanderthal occurred. B. The central issues of this chapter are tracing our primate heritage, the not-entirely-worked-out evolutionary pathway of humans, and the pathway of cultural evolution and its effect on the environment. I. Primate Diversity Module 19.1 The human story begins with our primate heritage. Review: Geological timeline (Module 15.1) and the comparison of human and baboon skeletons (Module 30.3). A. Primates include lemurs, tarsiers, monkeys, and apes. Humans are part of the ape group. The earliest primates were small, arboreal creatures that lived at the end of the Age of Dinosaurs, 65 million years ago (mya) (Module 15.1). B. Most living primates are arboreal, and humans (never strictly arboreal) retain in their bodies many traits that evolved with our arboreal relatives. Primitive primate characteristics, as exhibited by the slender loris (Figure 19.1A), include flexible shoulder and hip joints, maneuverable hands and feet, opposable thumbs and big toes, sensitivity to touch in the hands and feet, short snout, and eyes close together at the front (enhancing three-dimensional vision). C. The lorises, pottos, and lemurs form one group of primates (Figure 19.1B). All live in tropical forests, and all are threatened by habitat destruction. Of approximately 50 species of lemur to live on Madagascar, 18 are extinct because of human incursion into their habitat about 2,000 years ago.
Background image of page 1

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

View Full DocumentRight Arrow Icon
D. The tarsiers are the second group of primates that live in Southeast Asia and are ancestrally close relatives of anthropoids (Figure 19.1C). E.
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/10/2011 for the course BIOL 10 taught by Professor Kite during the Spring '11 term at Laney College.

Page1 / 7

Chapter 17 (Part II) - Introduction Review The role of...

This preview shows document pages 1 - 3. Sign up to view the full document.

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