Layout References Mailings Review View Help 1 Caption 1Heading 1 1 List Para 1 N
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Question
Layout References Mailings Review View Help 1 Caption 1Heading 1 1 List Para 1 Normal 1No Spac. Styles Paragraph Assignment 2 (Chapters 24, 25) Summer 2015 1 What is a "protocell"? How did they likely form, and what could they d 2. What is the "Cambrian Explosion," when dad it occur, and why is it significant? 3. How are radiometric dating and magnetic reversals used to determine the absolute age of rock strata? 4. How did atmospheric O2 accumulate over time? 5. Explain the endosymbiotic theory for the evolution of the eukaryotic cell and describe the evidence that supports this theory 6. Explain the function of Hox genes. Describe, with an example, how changes in the number, sequence, or expression of Hox genes can lead to major morphological differences between 7. Describe the significance of research on the differences in Pitx/ gene expression between marine and lake-dwelling threespinc sticklebacks. 8. Explain how bird and bat wings are homologous as vertebrate forelimbs, but analogous as wings 9. Define synapomorphy. How do these help us organize the tree of life? 10. Explain how molecular clocks are used to determine the approximate time of key evolutionary 11. List the characteristics and the hypothesized sequence of events in the origin of animals from 12. Compare the developmental differences betiveen protostomes and deuterostomes, including events single-celled eukaryotes (see the lecture slides) Saates)
Explanation / Answer
1. Protocell is called as protobiont. It is a self organized, spherical collection of lipids, refer to as stepping stone in the origin of life. They are form from RNA replicase and fatty acid membrane. Protocell are able of growth, replication and evolution.
2. Cambrian explosion is also known as Cambrian radiation. It happened 541 million year ago during Cambrian period. In this explosion, major animal phyla kingdom appeared .
3. Radiometric dating help us to know the radioactive age for volcanic ash, age of intervening layer is formed which is intermediate between these dates. Magnetic dating help us to know the age of magnetic field of earth, is used to know the strata life and year.
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