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Multiple births in humans are the exception and can be exceptionally rare in the largest mammals.
Feb 13, 2009 · Premature infants, common in multiple births, face a greater risk of breathing problems, brain and organ damage and, later in life, developmental problems and cerebral palsy.
The occurrence of DZ twinning varies among racial groups: multiple births are most common among people of African descent, less common among those of European descent, and least common among people of Asian descent. DZ twinning is most common in older mothers (up to about 40 years of age) and tends to recur in families having a history of ...
- The Editors of Encyclopaedia Britannica
Mar 7, 2021 · They're rare in humans: about three to four in 1,000 human births result in identical twins, according to the U.S. National Library of Medicine. And as far as scientists can...
Feb 13, 2019 · The aim of this study was to identify genetic variants influencing multiple births and to genetically correlate the findings across a broad range of traits.
- Hamdi Mbarek, Margot P van de Weijer, Mathijs D van der Zee, Hill F Ip, Jeffrey J Beck, Abdel Abdell...
- 2019
In rare cases, identical twins may be in the same amniotic sac. Non-identical twins occur when two separate eggs are each fertilized by a separate sperm. The two embryos that result are dizygotic, not genetically identical, and can be the same or different sex.
Many mammals give birth to more than one offspring at a time or to a litter (multiparous), each member of which has come from a separate egg. There are some mammals, however, that have only one offspring at a time (uniparous), although occasionally they may have more than one young.
