Skip to Content

Sponsors

No results

Tags

No results

Types

No results

Search Results

Events

No results
Search events using: keywords, sponsors, locations or event type
When / Where
All occurrences of this event have passed.
This listing is displayed for historical purposes.

Presented By: Ecology and Evolutionary Biology

EEB Thursday Seminar: Molecular evolutionary genetics of the “two rules of speciation” in Drosophila

Daven Presgraves, University of Rochester

Drosophila Drosophila
Drosophila
Speciation involves the gradual evolution of reproductive incompatibilities— including prezygotic incompatibilities that prevent the formation of species hybrids and intrinsic postzygotic genetic incompatibilities that render hybrids sterile or inviable. Two strong “rules of speciation” implicate a special role for sex chromosomes in the evolution of postzygotic genetic incompatibilities: Haldane’s rule, the observation that hybrids of the heterogametic (XY or ZW) sex preferentially suffer hybrid sterility and inviability; and the large X-effect, the observation that the X chromosome has a disproportionately large effect on hybrid sterility. Despite decades of effort, why the X chromosome plays a special role in speciation remains unclear. I will present results from our integrated genetic and genomic studies of speciation among the three closely related species of the Drosophila simulans species complex— D. simulans, D. sechellia, and D. mauritiana. Our high-resolution genetic mapping studies, speciation genomics analyses, and molecular identification of a new hybrid sterility gene enable new inferences about the molecular and evolutionary basis of the large X-effect and its consequences for speciation.

Light refreshments served at 4 p.m.
Drosophila Drosophila
Drosophila

Co-Sponsored By

Explore Similar Events

  •  Loading Similar Events...

Back to Main Content