Backward chromosome movement in crane-fly spermatocytes after UV microbeam irradiation of the interzone and a kinetochore.
Single anaphase chromosomes (in crane-fly spermatocytes) moved backwards after double irradiations with an ultraviolet light (UV) microbeam, first of the interzone and then of a kinetochore: the chromosome irradiated at the kinetochore moved backwards rapidly, across the equator and into the other half-spindle. High irradiation doses at the kinetochore were required to induce backward movement. Single irradiations of kinetochores or interzones were ineffective in inducing backward movements.
Wong
Raymond
R
Biology Department, York University, 4700 Keele Street, Toronto, Ontario M3J 1P3, Canada.
Forer
Arthur
A
D000705:Anaphase / Q000502:physiology / Q000528:radiation effects*; D000818:Animals; D002875:Chromosomes / Q000502:physiology / Q000528:radiation effects; D004175:Diptera / Q000166:cytology*; D018386:Kinetochores / Q000502:physiology / Q000528:radiation effects*; D008297:Male; D013090:Spermatocytes / Q000166:cytology / Q000528:radiation effects*; D008941:Spindle Apparatus / Q000502:physiology / Q000528:radiation effects*; D014466:Ultraviolet Rays