Homozygous females show polarized reduction of recombination to 4.3% between y and f with greatest reduction distally. X-chromosome nondisjunction temperature-sensitive; 16.7% at 25oC; reduced to 10.2% in oocytes exposed to 17oC during metaphase I and anaphase I; no X-chromosome loss at either temperature. Synaptonemal complex reduced in quantity and abnormal in structure. c(3)GOR28/Df(3R)sbd105 females exhibit no recombination and 32% X-chromosome nondisjunction. Less severe than c(3)G1.
R.F. Grell.