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.
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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