Dr. Fredric Janzen

Professor, Department of Ecology, Evolution, and Organismal Biology, Teaches:

Research interests in the Janzen Lab involve the study of ecology and evolution, including mechanistic work at the molecular/genomic and organismal levels, field studies that document the importance of phenotypic variation, and a comparative view of the long-term consequences of this variation. To do so, we often integrate molecular and quantitative genetic/genomic techniques with experimental laboratory and field studies, largely focusing on the impact of environmental and genetic/genomic factors in mediating the expression of physiological, behavioral, and life-history traits. Using these conceptual approaches in concert with comparative and computational approaches enables us to assess important biological issues, including 


  1. the biological significance of diverse sex-determining mechanisms, 
  2. the impacts of environmental and genetic/genomic factors on variation in early life-history traits, and 
  3. the current and historical genetic/genomic and demographic structure of populations, with an emphasis on elucidating adaptive processes and solving conservation concerns.
Area of Expertise: 
Evolution of Reptiles
Sex Determination
Population Biology
B.A., Biology, North Central College, 1985
M.S., Zoology, Colorado State University, 1987
Ph.D., Ecology and Evolution, University of Chicago, 1992
Postdoctoral Fellow, Population Biology, University of California-Davis, 1992-1994
341 Bessey Hall, 2200 Osborn Drive
ISU, Ames