Development of the posterior crossvein in crossveinless-like
strains of Drosophila melanogaster can be influenced by high temperature
shocks at specific times in pupal development.
Three sensitive periods were detected in age response studies
on Ona X, Ona II, 5-hi III; crossvein restoration at 14 hours in
pupal development, a crossvein...
I experimentally test the hypothesis that the potential for selfing
increases with plant size in Mertensia ciliata (Boraginaceae), a self-compatible,
profusely-flowering perennial. This follows from the
premises that 1) pollen dispersal by pollinators between flowers is
limited, and 2) individual pollinators, in this study bumblebees, will
visit more flowers per...
By examining the combined written, ethnographic and physical evidence of a surviving
steam-powered sawmill in the Douglas-fir region of the Pacific Northwest, this thesis
seeks to supply new insights into the operation and adaptability of antiquated machinery
during a period of rapid social and technological change and to develop a...
This investigation is concerned with the determination of the temperature-effective period (T.E.P.) for crossvein development at physiological temperatures using three isogenic crossveinlesslike (cvl) lines of Drosophila melanogaster.
The method used to determine T.E.P. relies on temperature differences in phenotypes and on a program of transfers from one temperature to another...
The frequency of exchanges was measured in a reversed
acrocentric compound X chromosome that is deficient for interstitial
heterochromatin. Previous studies on similar chromosomes
containing interstitial heterochromatin have demonstrated a very
low frequency of single exchanges, and high frequencies of the
double and no exchange classes. It has been postulated...