biology notes - Evolution 20:48 Lecture 14 Evolution...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
Evolution 20:48 Lecture 14: Evolution I. Evolution has 2 meanings to biologists:  a process  and a theory. A. What do biologists mean by the process of evolution? Process: a change over many generations in the relative frequency of genotypes  that occur in a population a. What is a population? A group of individuals of the same species living in the same area at the same  time b. Can individuals evolve? No, they do NOT evolve. c. Can populations evolve? Yes, they are the smallest biological unit that can evolve d. Example B. Observations of the Process of Evolution a. What are some examples of the process of evolution that people have been  able to witness? - antibiotic resistance in bacteria 
Background image of page 1

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

View Full DocumentRight Arrow Icon
Biology 1050 Spring 2009 Dr. Vance-Chalcraft - pesticide resistance in insects - drug-resistance in HIV b. Explain the resistance of lice to the common chemical treatment. - lice become resistant to treatment C. What is the theory of evolution? All species decend from a single common ansestor, and all species are the result  of millions of years of change a. How can we graphically depict the theory of evolution? b. The contributions of Charles Darwin to the study of evolution. The origin of species – 1. Provided evidence of evolution            2. proposed a mechanism for evolution, called natural selection II. Evidence of Evolution – There are many types of evidence for evolution. - fossil record, biogeography, homologies A. The fossil record a. What are fossils?  A preserved remnant or impressions left by organisms that used to be alive. 2
Background image of page 2
Biology 1050 Spring 2009 Dr. Vance-Chalcraft b. Figure 9.21. c. What is one way you can tell the age of fossils?   What fossils are oldest? Bacteria  ii) How old are they? 3.5 billion years old What organisms first appear in the fossil record most recently? animals d. What have paleontologists discovered? Have discovered many transitional forms that link past to present B. Biogeography a. What is biogeography?             The study of the geographical distribution of species 3
Background image of page 3

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

View Full DocumentRight Arrow Icon
Biology 1050 Spring 2009 Dr. Vance-Chalcraft b. What does biogeography suggest? Suggest today’s organisms descended from ancestral forms c. Describe what Darwin noticed about the biogeography of animals that might  influence how they evolved. d. How do the marsupial mammals in Australia demonstrate these principles of  biogeography? C. Homologies
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/29/2010 for the course BIO 181 taught by Professor Grant during the Spring '10 term at East Carolina University .

Page1 / 26

biology notes - Evolution 20:48 Lecture 14 Evolution...

This preview shows document pages 1 - 5. Sign up to view the full document.

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