Origin of apparent polyploid spermatocytes in the mouse.
D000818:Animals; D002869:Chromosome Aberrations; D005260:Female; D006579:Heterozygote; D008297:Male; D008540:Meiosis; D051379:Mice; D010063:Ovum / Q000166:cytology; D011123:Polyploidy; D011831:Radiation Genetics; D013094:Spermatozoa / Q000166:cytology*