the relative involvement of the x- and y-chromosomes in partial losses was determined by ( a ) irradiating males with an x-chromosome centromere marked by a y+ translocated to the short right arm , and a y-chromosome marked by w+ , and ( b ) comparing the frequencies of fragments recovered from irradiated males with a normal , marked y-chromosome and from irradiated males and a deleted bb y-chromsome .
C0008633
chromosome
C0007709
centromere