- Recieved the scedule, UP, notes, Darwin packet, and lab 38
- Watched video clips about evolution
- Answered the questions on UP 7-8 (see below)
You can view the videos at: http://www.pbs.org/wgbh/evolution
Then type the video titles in the convenient little search box in the top- right corner of your screen, and find the link to the video. Note: You need quicktime to see the videos, and the subtitles are really useful!
Video 1: Isn't Evolution Just a Theory?
Question: Is it correct to say that evolution is JUST a theory?
- Charles Darwin pioneered the idea that all life is connected, and the theory of natural selection
- Theories pull together observations to create "rules" for how the universe works
Video 2: Who was Charles Darwin?
Question: Why was Darwin considered a "Revolutionary"
- Darwin's work was highly controversial because it contradicted many established religious and scientific beliefs at the times
- In order to prove his theories, he traveled the world and carefully documented life's great diversity, then analyzed the patterns
Video 3:How do we know that evolution happens?
Question:Describe the transitional fossils associated with whales.
- The evolution of species can be plotted on an evolutionary timeline, which chronologically shows the changes ancient species went through in order to evolve into modern species
- An ancient species that shares common traits with a modern one, and has no similar, discernable ancestors, may be the original ancestor to modern species
- As time passes, the ancestor changes and adapts and become more similar to modern species
Video 4:L How does evolution really Work?
Question: Describe the process of natural selection and how it effects hummingbird populations.
- Genetic Variation: different individuals within a species express different traits, some more favorable than others
- Overproduction of offspring: more offspring are produced than the number that can survive
- Struggle for existence: The overload of individuals compete for resources
- Differential survival and reproduction: Individuals without favorable traits are at a disadvantage for obtaining necessary resources. These individuals die. Those left have more favorable traits and have a higher chance of reproduction, so the favorable traits are inherited by the next generation.
Video 5: Did Humans Evolve?
Question: Explain how DNA sequences are used to provided eveidence of a commoon ancestor?
- Humans did not eveolve form chimapnzees, but both species shared a common ancestor
- Humans and primates have similar DNA, which helps prove this relationship
- If two species share the same gene sequences, aside from a few mutations, they are related
- Physical trait similarities, fossil evidence, and DNA similarities prove common ancestry
Video 6: Why does evolution matter now?
Question: Why is the theory of evolution an important theory for doctors and the field of medicine? How does the theory affect the way illnesses and treatments are approached?
- Some microbes can evolve to become resistant to antibiotics, which is very dangerous
- If one drug does not kill ALL of the microbes, the remaining resistant microbes reproduce and form an entire population of microbes resistant to a drug. Thus, they have evolved to evade our killing, which can result in difficult to cure diseases.
- In result, multiple drugs are often prescribed
Homework is on Google Docs (hint- read chapter 13, chapter 1 p. 8-13, the Darwin packeet, and begin on UP 5)
Meet in computer lab tomorrow!!!!!!!
Maddy is the next scribe