Related Content
Search Google Scholar for:
More Information
Related Jobs from ScienceCareers
|
|
Science 29 November 2002:
Vol. 298. no. 5599, p. 1675
DOI: 10.1126/science.298.5599.1675g
|
|
This Week in Science
The formation of a new species is generally thought to be gradual and to require isolation. Greig et al. (p. 1773) show experimentally that speciation can occur rapidly after hybridization of yeast species. Although most of the hybrids were infertile, the vast populations that could be created with yeast allowed viable hybrid spores to be collected. Subsequent generations of hybrids had variable but increasing fertility, and showed a spectrum of growth temperature optima that depended on the parental phenotype and contribution to the offsprings' genomes. The authors suggest that the reproductive isolation seen among the different generations and with their parents originates in different combinations of gene and chromosomal incompatibilities acting across the generations. In the wild, the fitness of yeast hybrids may be compromised so much by environmental conditions that speciation is curtailed.
|
|
Science. ISSN 0036-8075 (print), 1095-9203 (online)
