lecture 9 - EXAM 1 Grade A 90- 100 B 80- 89 C 70- 79 D 60-...

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EXAM 1 Grade # students A 90- 100 9 B 80- 89 27 C 70- 79 28 D 60- 69 17 F < 59 10
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p 2 + 2pq + q 2 = 1 Frequency of alleles p = 0.5 q = ? Frequencies of genotypes? p 2 = 2pq = q 2 =
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In 1908 G. Hardy and W. Weinberg independently proposed that the frequency of alleles and genotypes in a population will remain constant from generation to generation if the population is stable and in genetic equilibrium. Five conditions are required in order for a population to remain at Hardy-Weinberg Equilibrium: 1. A large breeding population 2. Random mating 3. No change in allelic frequency due to mutation 4. No immigration or emigration 5. No natural selection
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How Does Evolution Really Work? LINK What are the four components of natural selection?
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Darwin's theory of evolution by natural selection has four components: Overproduction — More organisms are born than will survive and reproduce. Competition — Organisms compete for resources and to avoid being killed. Variation — Not all organisms are the same. Selection — Based on their traits, some organisms are more likely to survive and reproduce than others.
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Evolution in the News
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Course mini- evaluation Be sure to consider lectures, assignments, exams, clicker questions, readings: 1. What are three aspects of this course that you like/enjoy/benefit from? 2. What are three aspects of this course that you don’t like/ would like to change/ are frustrated by? 3. What suggestions do you have for the course? 4. How often do you come to class? How attentive are you? Do you read the text? Do you review the lecture slides? 5. If you did poorly on the exam, how will you approach the next exam differently?
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Evolutionary Event Millions of Years Ago Meters 1. Origin of Earth 4600 10.00 2. First evidence of Life 3500 7.62 3. Cyanobacteria abundant 2200 4.79 4. First eukaryotes 2100 4.56 5. Advanced single cells 1500 3.26 6. Multicellular life 1200 2.60 7. Cambrian “Explosion” 600 1.31 8. First terrestrial life 500 1.09 9. First evidence of fish 480 1.04 10.First evidence of amphibians 370 0.80 11.First evidence of trees 350 0.76 12.First evidence of reptiles
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This note was uploaded on 03/19/2008 for the course BIOL 101 taught by Professor Annestork during the Fall '08 term at Ithaca College.

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lecture 9 - EXAM 1 Grade A 90- 100 B 80- 89 C 70- 79 D 60-...

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