1 / 11

Warmup

Warmup. Complete the sentences: 1) Separate species… 2) Speciation happens when… 3) It is different than genetic drift in that…. DECEMBER 15 TH 2010. DICHOTOMOUS KEYS , HOMINIDS. Learning Goals. Be able to use and create a dichotomous key to identify organisms. Relevant Standard:

gerik
Download Presentation

Warmup

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Warmup Complete the sentences: 1) Separate species… 2) Speciation happens when… 3) It is different than genetic drift in that…

  2. DECEMBER 15TH 2010 DICHOTOMOUS KEYS, HOMINIDS

  3. Learning Goals • Be able to use and create a dichotomous key to identify organisms. • Relevant Standard: • Students know how to construct a simple branching diagram to classify living groups of organisms by shared derived characteristics, and expand the diagram to include fossil organisms. • Be able to describe recent evolution resulting in modern humans.

  4. Dichotomous Key Dichotomous Keys are used to classify organisms based on only a few observations. They use simple “either or” questions, and based on the answer to the question redirect you either to another question or the scientific name of the species. Good dichotomous keys are both easy to use and reflect how species are related according to evolutionary branching tree diagrams (phylogeny).

  5. Guided Practice The genus is “Nornos”. Find the full scientific name for each organism using the dichotomous key. B) A) C) D) E) F) G)

  6. Guided Practice Solutions NornosWalaWala NornosCalifornus NornosRajus NornosKentuckyus Nornos Dallas NornosBeverlus NornosYorkio http://www.biologycorner.com/worksheets/dichoto.html

  7. Independent Practice Create a dichotomous key for some common hominids. Human Chimpanzee Gorilla Orangutan Gibbon

  8. Independent Practice Trade dichotomous keys with a partner and see if they are useful for identifying these two hominids:

  9. Main Fossil Sequence

  10. Noteworthy: • “Lucy” and “Ardi” • Walking upright developed early on. • Brain size and tool use developed simultaneously. • Increased brain development meant more child-care, which meant more opportunity to educate/culture offspring. • True language use developed last. • The common ancestor w/ chimpanzees is estimated to be 5M8M old. • The common ancestor w/ a chimpanzee is not the same as a modern chimpanzee.

  11. Monogenesis Theory vs. Multiregional Theory Recall the difference between genetic drift and speciation. The Multiregional Theory states that modern humans evolved in parallel in multiple parts of the world. They presumably interbred which reduced genetic diversity to its present level. The “Java Man” and the “Neanderthal Man” contributed genes to the modern Homo Sapiens. The Monogenesis Theory states that multiple migrations originated in Africa, where each wave outcompeted previous waves and gradually replaced populations such as the “Java Man” and “Neanderthal”. While some interbreeding is possible, it was not a significant factor. More evidence favors the Monogenesis Theory.

More Related