Trisomy-3,4 and triploidy (3A-ZZZW) in chick embryos: autosomal and sex chromosomal nondisjunction in meiosis.
The first known cases of trisomy-3, trisomy-4, and triploidy (3A-ZZZW) in chickens are reported. The trisomic embryos were near death at 4 days of incubation; the triploid embryo appeared normal and probably could have developed further. Although the triploid (3A-ZZZW) was found after sampling more than 2000 embryos, the trisomic-3 and trisomic-4 embryos were discovered in the first sampling of a line of chickens selected for low egg production. These studies suggest that the sex chromosomes (Z and W), as well as the autosomes, can undergo nondisjunction in meiosis of chickens.
D000818:Animals; D002642:Chick Embryo / Q000002:abnormalities*; D004171:Diploidy; D005260:Female; D007621:Karyotyping; D008297:Male; D008540:Meiosis; D011123:Polyploidy; D012730:Sex Chromosomes; D014314:Trisomy