Abstract
Hyalophora cecropia (L.) is dimorphic for the termination of diapause at Urbana and Chicago, Illinois, about 40°6' and 41°51' north latitude respectively. Under natural conditions the emergence of the adults is clearly bimodal in both places. At Urbana the early emergers (Group I) initiate development at the end of March and emerge during the second half of May; the late emergers (Group II) initiate development at the beginning of June and emerge during the second half of June and the first week of July. Members of either group produce some progeny which emerge with Group I and a majority which emerge within Group II.The bimodality has a genetic basis. In either two or three generations we were able to line select from the Urbana population strains which averaged over 75% emergence with Group I as compared with the average of about 8% which was typical of the wild population.Reciprocal transfers in the fall of wild-collected cocoons between Urbana and the Chicago area revealed that Group II exhibits geogr...
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
