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by: Favian Swaniawski


Favian Swaniawski
GPA 3.82


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About this Document

Class Notes
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This 10 page Class Notes was uploaded by Favian Swaniawski on Saturday September 12, 2015. The Class Notes belongs to BIOL 493M at West Virginia University taught by Staff in Fall. Since its upload, it has received 23 views. For similar materials see /class/202740/biol-493m-west-virginia-university in Biology at West Virginia University.


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Date Created: 09/12/15
Lecture 17 Species and Hybridization 06139 20 2006 Course Logistics 0 Reminder no class on Wednesday November 1 0 Extra credit No presentations for undergrads BUT 0 Everyone will have one extra credit opportunity for 25 points gt Present an extra paper no slots left OR gt Read a paper of your choice in molecular ecology and write 2 page critique gt See me for approval of paper and specific instructions gt Due last day of class chedule changes see website gt Final lecture before Thanksgiving Break gt Proposal presentations begin immediately after Thanksgiving gt 10 minute presentation 5 minutes for questions strictly enforced Please sign up gt Final exam due Thursday December 14 at 1 pm my office Las r Time OPhylogenefics and phylogeogr aphy OPopulm ion origin and assigmem tests Today OAssignmem tests 95pecies Popula rion Assignment Likelihood 0 Can immigran rs be idenTified based on genoTypes ll PI lKimlllijl Pr39individual is from popula rion i O quotAssignmen r Tes rsquot based on A Primarilllr l Pr39individual is from popula rion i39 allele frequencies In sour39ce populaTions andgene ric composITIon of IndIVIduals O LikelihoodBased Approaches gt CalculaTe likelihood Tha r individual genoType or igina red in p ar39Ticular39 p opula rion gt Based on simula red dis rribu rions of genotypes and likelihood calcu laT ions gt Assume HardyWeinberg and linkage equigl i bria gt Susceptible fro bias based an unusual ggen oTypes Population Assignment DistanceBased Clustering M J mm a a ltgt Uni H mm gi aaups an J s 39l 39xo AU a 7 39 u em u med by 9 eu UL n W a A n 133 u ances amang indivmmls Taita thrush Turdushelleri gt olf Ten T 155 Taita thrushes sampled in Kenya correspond To Popu39ahons39 and genotyped at 7 microsatellite gt No good To sfafjs cql ly ocu assess Vail I JIT Y39 of clusters Clustered using pairwise genetic distances and UPGMA Population AssignmentModelBased Clustering O Simultaneous maximization of likelihood of population structure I 332a and origin of Ngo individuals 0 Based on maximizing HardLWeinber equili rium and inkage equilibrium 9 Robust way to identify populations genetic Chawia Mbalalo POPUlG39l39th Of39l in Of Distribution of ancestry coefficients for thrushes sampled individuals in erred from three populations O n Jonathan K Pritchzu d Matther Stephens and Peter Donnelly ge Genetics 155 945DSQ June EDUD Population Assignmem ExampleFish Stories Que mm m Gamma Nd CW Ty 35 7 WWQSWM ngh o v SQHuwgm mum hm mguccn quotrm thee mm 8 2ij Q U Z L43 ltgt Cmngpmcgd fmm ag m sh fmm CQH W kach 10001 2 7 o o n g 111 KQWUQHWQTHWQ TWCDm a quotL R Prinnncfuncl others Pma R Sm Land B 2000 267 16997170 ltgt7 m r c a Lake Saimaa Markef sh ltgt HikQH hmd m ygi u nsh WQS pm Misha vim proportion 8 12 16 20 24 logm genowpe likelihood Species Concepts OAt least 20 different Species concepts exist in literature Holy Grail of Evolutionary Biology OBiological Species Concept quotGroups of actually or potentially interbreeding natural populations which are reproductively isolated from other such groupsII Mayr 1942 quotSystematics and the origin of species3939 OWhat are some problems with this concept Next Time OHybr39ids and species differentiation OMapping and QTL Analysis


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