BIO 04 - 17 SEP - simple,butelegant September 17 Lecture 4...

Info iconThis preview shows pages 1–10. Sign up to view the full content.

View Full Document Right Arrow Icon
04/26/10   1 BIO152 Natural Selection  simple, but elegant September 17 Lecture 4
Background image of page 1

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

View Full DocumentRight Arrow Icon
04/26/10   2 Tutorial Friday natural selection Online quiz (TUT site) 12 noon Thurs- 9am Friday Review text readings (Ch1.2, 24.1, 24.2,, 24.3) Prepare the worksheet
Background image of page 2
04/26/10   3 Lecture outline-  Introduction to the process of evolution Four components of natural selection Example-beak size (Freeman 24.3) Artificial selection (Freeman 1.2)
Background image of page 3

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

View Full DocumentRight Arrow Icon
04/26/10   4 Microevolution Microevolution —looks at how populations change over time [small scale changes in ‘small’, related group] May occur rapidly May be measured What is a population ?
Background image of page 4
04/26/10   5 Natural selection 1. More individuals are born than survive and reproduce. 2. Individuals vary in characteristics which are heritable . 3. Certain heritable characteristics help individuals survive and reproduce better than other characteristics.
Background image of page 5

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

View Full DocumentRight Arrow Icon
04/26/10   6 Natural selection: 4 components 1. Variation -individuals in a population vary in traits 2. Inheritance -some variation is passed on to offspring 3. Survival -only some offspring live long enough to reproduce; some individuals produce more offspring 4. Survival is not random - some heritable traits offer an advantage
Background image of page 6
04/26/10   7 More organisms are born than  survive
Background image of page 7

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

View Full DocumentRight Arrow Icon
04/26/10   8 Table 1 Population growth ideal versus  natural conditions Initial population Final population Time Ideal actual 2 elephants 750 yr 1.9 x10 6 130 2 house flies 5 mo 1.9 x10 20 890 1 E. coli 48 hr Cover earth 2m 1.5x10 6
Background image of page 8
  9 And more organisms survive than  reproduce What affects the outcome? The ecology: interaction of the individual in
Background image of page 9

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

View Full DocumentRight Arrow Icon
Image of page 10
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 38

BIO 04 - 17 SEP - simple,butelegant September 17 Lecture 4...

This preview shows document pages 1 - 10. Sign up to view the full document.

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