L04 chapter 3

L04 chapter 3 - Genetics Bio 2306.04 Chapter 3 Basic...

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1 Genetics Bio 2306.04 Chapter 3: Basic Principles of Heredity
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2 Johann Gregor Mendel Mendel joined Augustinian monastery Ordained priest Studied at University of Vienna math, chemistry, botany, entomology Began experiments with pea plants in 1856 Published study in 1866 basic principles of heredity
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3 Mendel’s findings attracted little attention Elected abbot of his monastery too busy to continue research Died in 1884 Work “rediscovered” in 1900 We now appreciate Mendel’s work– a lot!!!!!
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4 1. Used the pea plant—many advantages: easy to cultivate 1 year generation time (seems long today) many progeny (each seed is an individual) controlled crosses possible many varieties available Why was Mendel Successful? Pisum sativum
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5 2. Selected characteristics with easily distinguishable phenotypes
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6 3. Looked at each trait separately 4. Used the scientific method 5. Kept careful records Why was Mendel Successful?
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9 Dominance Recessive
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11 1. Each individual possesses two factors (alleles) coding for a trait (1 from mom, 1 from dad) 2. The 2 factors separate when gametes are formed Mendel’s 1 st Law: Principle of Segregation Monohybrid Cross A cross involving a single trait i.e. seed shape
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17 Determining Progeny Ratios Genotypic ratio Phenotypic ratio 2 methods Punnett square method Probability method
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20 Probability Method What is the likelihood that an event will occur? P = number of times an event occurs number of all possible outcomes P of drawing an Ace from a normal deck of cards? 4/52 Multiplication Rule Addition Rule
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21 Multiplication Rule: The probability of two independent events occurring together is the multiplication of their independent probabilities P1 = probability of event 1 (E1) P2 = probability of event 2 (E2) Probability of E1 and E2 = P1 x P2 key word “and” events must be independent!!!!!!
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What is the probability of rolling a die twice and obtaining a four on each roll? Probability on first roll = 1/6
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This note was uploaded on 04/29/2008 for the course BIO 2306 taught by Professor Durhkopf during the Spring '08 term at Baylor.

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L04 chapter 3 - Genetics Bio 2306.04 Chapter 3 Basic...

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