Discussion 03-04

Discussion 03-04 - ETX 20 Discussion Section Brittany...

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ETX 20 Discussion Section Brittany Huntington March 04, 2009 bcrowland@ucdavis.edu
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Outline  Paternity Assignment—Due March 12th  Accident Reconstruction and  Biomechanics  Wildlife Forensics  CSI For Animals  Namely, what is melamine?
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Reminder The final isn’t this weekend, but the following  one! Next week’s discussion will be an interactive  review session. Since your final is open note, I am not giving  you such a comprehensive/detailed review  sheet as last time.  I will create a list of  topics, ideas, and words you should know,  and we can discuss them next Wednesday. So, if possible, print out the review sheet after I post it  and bring it with you to discussion!
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Homework 5: Paternity When determining paternity it is first important to  determine if the individual could be the father. Child TPOX ( 12 , 13 ) Mother TPOX ( 12 ,12) Possible Father TPOX (11,12)  Who the mother is- not typically an issue The mother contributed the 12 allele (that is all  she could have contributed) this leaves a 13  allele of the child that had to come from the  father. This possible father has been excluded  due to there being no 13 allele in common
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Paternity The question in mind is:   Gpp=Gp or Gpp≠Gp When it is possible he could be  the father, then  statistics/calculations are made  to determine the likelihood Gc =Child TPOX ( 12 , 13 ) Gm =Mother TPOX ( 12 ,12) Gpp= Possible Father TPOX  (11, 13 Use the table given in the  homework assignment p = 0.232 (the frequency of  allele j, or TPOX 13—the  common allele between father  and child) For this example the LR is 1/2p = 1/(2*0.232) = 2.16 Note: sometimes you may need  to change what you call i,j,k,l to 
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Paternity For each locus you repeat the procedure (the LR  formula is dependent on the genotypes of all  three individuals and does change) After the LR has been calculated for each locus,  you multiply the values together The final value give the likeliness. For example if  the final value is 300, then it is 300 times more  likely if Gpp=Gp than Gpp≠Gp. In other words it  is 300 times more likely that this potential father  is the father than not the father. 
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LR       
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Questions regarding Paternity?
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Goal of reconstruction Determine why it happened From Post-crash and At-crash can get clues about  Pre-crash Point of Impact determination NHTSA Matrix Evaluate for Human, Vehicle, and Environment Must use for each vehicle, each occupant, each pedestrian,  etc. Three phases of accident
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Discussion 03-04 - ETX 20 Discussion Section Brittany...

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