The EUROHAZCON study also looked at 21 landfill sites in Britain, France, Italy, Denmark, and Belgium that took hazardous waste in a case-control study of nonchromosomal
(Dolk et al.
It's seen in Down syndrome as well as nonchromosomal
abnormalities, such as cytomegalovirus and meconium ileus.
The 23 chromosomes in a sperm are more tightly packed than are the 23 in an egg, and eggs contain more nonchromosomal
ingredients than do sperm.