Lecture 28 Genetics III Probability and Pedegrees

Lecture 28 Genetics III Probability and Pedegrees - Biol141...

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Biol141 Foundations in Modern Biology Cellular Biology and Genetics Lecture 28 – Friday, November 4 th , 2011 Genetics III – Probability and Pedegrees. Reading: Freeman, Emory 2 nd Ed. Chapter 13 pages 230-236.
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Learning objectives At the end of this lecture, you will be able to: 1) Explain the basic conventions of probability. 2) Determine the probability of heterozygous parents for two different alleles of a given gene having homozygous or heterozygous offspring. 3) Calculate the probabilities of the different outcomes for dihybrid crosses. 4) Identify dominant or recessive traits by examining human pedigrees.
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How often do you predict a plant would arise that produces wrinkled, green seeds from SsYy parents? Last time : Random fertilization of gametes results in offspring with phenotypes in a 9:3:3:1 ratio. Only a 1 in 16 chance. 9 possible individuals have at least one copy of each Dominant allele: S_Y_ 3 possible individuals have a Dominant allele for only one of the two genes, they are homozygous for recessive alleles of the other gene: S_yy ; or ssY_ 1 possible individual is homozygous recessive for both genes: ssyy .
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The basic conventions of probability : – If an event is certain to happen, its probability is 1. – If the event cannot happen, its probability is 0. – Otherwise the probability is between 0 and 1.
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This note was uploaded on 04/02/2012 for the course BIO 141 taught by Professor Dr.cafferty during the Fall '11 term at Emory.

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Lecture 28 Genetics III Probability and Pedegrees - Biol141...

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