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DTSTAMP:20260428T233021Z
UID:585d0bc6379cc434036612@ist.ac.at
DTSTART:20170215T094500
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DESCRIPTION:Speaker: Daven C. Presgraves\nAbstract: Speciation involves the
  gradual evolution of reproductive incompatibilities between populations—
  including prezygotic incompatibilities that prevent the formation of hybr
 ids and intrinsic postzygotic genetic incompatibilities that render hybrid
 s sterile or inviable. Two strong “rules of speciation” implicate a spec
 ial role for sex chromosomes in the evolution of postzygotic genetic incom
 patibilities: (1) Haldane’s rule\, the observation that hybrids of the he
 terogametic (XY or ZW) sex preferentially suffer hybrid sterility and invi
 ability\; and (2) the large X-effect\, the observation that the X chromoso
 me has a disproportionately large effect on hybrid sterility. Despite deca
 des of effort\, why the X chromosome plays a special role in speciation re
 mains unclear. I will present results from our genetic and genomic studies
  of speciation among the three closely related species of the Drosophila s
 imulans species complex— D. simulans\, D. sechellia\, and D. mauritiana. 
 Findings from our high-resolution genetic mapping studies\, speciation gen
 omics analyses\, and molecular identification of a new hybrid sterility ge
 ne enable new inferences about the molecular and evolutionary causes of th
 e large X-effect and its consequences for speciation.
LOCATION:Mondi Seminar Room 3\, Central Building\, ISTA
ORGANIZER:pdelreal@ist.ac.at
SUMMARY:Daven C. Presgraves: Molecular evolutionary genetics of the “two r
 ules of speciation” in Drosophila
URL:https://talks-calendar.ista.ac.at/events/288
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