Haploidy in preattachment bovine embryos.
Four of twenty-four bovine embryos (day 5-7) subjected to chromosome analysis had haploid cells in metaphase. Two were clearly n/2n. The origin of the haploid cells was determined to be male in two embryos, owing to the presence of a Y chromosome or a male marker chromosome suggesting spermatozoa in division.
D000818:Animals; D001755:Blastocyst / Q000166:cytology*; D002417:Cattle / Q000196:embryology* / Q000235:genetics; D047108:Embryonic Development; D005260:Female; D006238:Haploidy; D007621:Karyotyping; D011247:Pregnancy