1 / 13

Evidence for Evolution

15 Feb. 2012. Evidence_Evolution-Lab.ppt. 2. Definitions. Evolution: change in average phenotype of population through many generations;

adamma
Download Presentation

Evidence for Evolution

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. 15 Feb. 2012 Evidence_Evolution-Lab.ppt 1 Evidence for Evolution Mader, Exercise 12

    2. 15 Feb. 2012 Evidence_Evolution-Lab.ppt 2 Definitions Evolution: change in average phenotype of population through many generations; “descent with modification.” Phenotype: appearance of organism(s) as a result of gene expression.

    3. 15 Feb. 2012 Evidence_Evolution-Lab.ppt 3 Evidence for Evolution Homology: presence of the same character in 2+ species, inherited from common ancestor. “Same character” may have been modified since divergence.

    4. 15 Feb. 2012 Evidence_Evolution-Lab.ppt 4 Ways HOMOLOGY provides evidence for evolution. 1. Comparative Anatomy: 2. Comparative Embryology: 3. Comparative Fossil Anatomy: 4. Comparative Physiology & Biochemistry:

    5. 15 Feb. 2012 Evidence_Evolution-Lab.ppt 5 HOMOLOGY Comparative Anatomy: Homologous characters are in the same position relative to other body parts. Vertebrate skull & vertebrae Limbs and limb bones “Soft” anatomy Plant stems, leaves, roots, buds Flower parts Compare human to cat, dog, horse, etc.

    6. 15 Feb. 2012 Evidence_Evolution-Lab.ppt 6 HOMOLOGY Comparative Embryology: Homologous characters develop from same embryonic tissues in the same way. see Fig. 12.5

    7. 15 Feb. 2012 Evidence_Evolution-Lab.ppt 7 HOMOLOGY Vertebrate embryos (fig. 12.5) Pharyngeal pouches ? arches & clefts Somites ? vertebrae & muscles Tail bud, Limb buds Eyes, Brain lobes Much more beyond what we can do today!

    8. 15 Feb. 2012 Evidence_Evolution-Lab.ppt 8 HOMOLOGY Comparative Fossil Anatomy: the Fossil Record. Extends comparative anatomy into the past (Figs. 12.1 & 12.2)

    9. 15 Feb. 2012 Evidence_Evolution-Lab.ppt 9 HOMOLOGY Comparative Fossil Anatomy: the Fossil Record. Fossils to know: Ammonites (ammonoids), bivalves, brachiopods, corals, crinoids, ferns, gastropods, shark teeth, trilobites. Know (only): How to recognize, When group appeared, When group went extinct.

    10. 15 Feb. 2012 Evidence_Evolution-Lab.ppt 10 HOMOLOGY Comparative Physiology & Biochemistry: Physiological processes and biochemistry show homology too. Processes of digestion, digestive enzymes. Thyroxin regulation of metabolic rate. Glycolysis and Krebs cycle Production of ATP ATP as “energy currency” DNA & RNA as genetic code

    11. 15 Feb. 2012 Evidence_Evolution-Lab.ppt 11 HOMOLOGY Comparative Physiology & Biochemistry: Cytochrome c and the “protein clock” Figure 12.6 Cytochrome c is a protein of ~400 amino acids 20 amino acids make all proteins like letters of alphabet Cyt c is a “word” of ~400 “letters.” Rarely “misspelled,” misspelling preserved in descendants

    12. 15 Feb. 2012 Evidence_Evolution-Lab.ppt 12 HOMOLOGY Cyt c in different species can differ Mutation Frequency (rate) of mutation ? “protein clock” How fast does the clock tick? (Calibration?) Does the clock keep good time (tick regularly)?

    13. 15 Feb. 2012 Evidence_Evolution-Lab.ppt 13 Review Rat & Frog dissections, shark, lamprey, etc. Metric measurement: length, weight, volume Plant body Kinds of stems & roots Stem cross sections of monocot & dicot Key to Trees of Atlanta Reproduction in Plants Key to Fruit Types Plant life cycles in Angiospermae, Coniferophyta, Pterophyta, Bryophyta Flower parts

More Related