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Examines sex-chromosome mosaicism in spermatozoa from a mosaic male with fertility problems. Difference in the total incidence of karyotypically abnormal spermatozoa between the patient and the 46,XY male control; Incidence of some types of disomic X+Y+18 (24,XY) and X+18+18(24,X,+18) spermatozoa in the patient's semen sample.

Investigates non-invasive exclusion of fetal aneuploidy in an at-risk couple with a balanced translocation. Identification of fetal nucleated erythrocytes; Identification of fetal gender; Presence of an unbalanced chromosomal translocation.