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DTSTART:20140330T030000
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DTSTART:20131027T020000
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DTSTAMP:20260504T150513Z
UID:50040450a406e@ist.ac.at
DTSTART:20131111T163000
DTEND:20131111T173000
DESCRIPTION:Speaker: Spencer Barrett\nAbstract: Plant populations of many s
 pecies are reproductively subdivided into\nmorphologically distinct mating
  groups. These polymorphic sexual systems have\nbeen of considerable inter
 est to evolutionary biologists since Darwin’s classic work\n“Different f
 orms of flowers on plants of the same species” (1877). Indeed\, many\nfun
 damental concepts in genetics\, including linkage\, supergenes\, epistasis
  and\nfrequency-dependent selection were developed\, in part\, on early st
 udies of plants\nwith sexual polymorphisms. In this talk I will review our
  recent studies on two of the\nmost attractive sexual polymorphisms for ev
 olutionary analysis – dioecy and\nheterostyly – and address several outs
 tanding issues concerned with their evolution\nand maintenance. For dioecy
 \, I discuss the demographic and genetic mechanisms\ngoverning biased sex 
 ratios in populations\, and some recent insights into the\nevolution of pl
 ant sex chromosomes. For heterostyly I examine the conditions\nfavouring t
 he evolutionary breakdown of this floral polymorphism\, and the\ndemograph
 ic and genomic consequences of the transition from outcrossing to\nselfing
 . Throughout I stress the importance of intra-specific variation for studi
 es of\nevolutionary transitions in plant reproductive systems.
LOCATION:Raiffeisen Lecture Hall\, Central Building\, ISTA
ORGANIZER:ihetzenauer@ist.ac.at
SUMMARY:Spencer Barrett: The Institute Colloquium: Demographic and evolutio
 nary genetics of polymorphic sexual
URL:https://talks-calendar.ista.ac.at/events/496
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