Italian mode family Gucci ’s spring / summertime 2023 show , Twinsburg , featured 68 sets of selfsame Twin sit on the runway . That impressive number of superposable twins in one place got us think : what is the science of identical twin birth ?
Monozygotic twins(aka superposable Twin ) are distinct from dizygotic twins ( fraternal , or non - identical , twins ) . For biovular twin , two dissimilar sperm cells fertilize two separate egg cells during one pregnancy . However , for identical twins , only one testis is fertilized . This single nut then splits , creating two ( or more ) embryo with the same hereditary makeup .
Worldwide , four in every 1,000births are identical twins .
Image Credit: National Human Genome Research Institute
Despite what you may think , the probability of having identical twins are not actually thought to be down to genetics at all ( conversely , the chances of have fraternal twinsvery much can be ) . The UK National Health Servicestatesthat “ Everyone has the same chance of having monovular Twin : about one in 250 . ”
There is anunconfirmed hypothesisthat factor involved in cell stick together are somehow call for with the organization of identical twins , which would explain why some family have a statistically improbable figure of monovular Gemini .
A2021 papertitled “ Twin Peaks : more twinning in humanity than ever before ” says that increased usage of richness treatments and people starting their families at older age , among other factors , has contributed to the ascent in twin birth in late years . The authors do note that “ Most of this gain is in dizygous twinning , although there is also grounds for a smaller growth in monozygotic twinning associated with [ medically assisted procreation ] . ”
A2020 paperdescribes the earliest reported case of superposable similitude : two male infants who were buried together around31,000 old age ago . One twin sadly die at nativity , and the other died around 50 day later .
According to UK charityTwins Trust , “ multiple pregnancies are , compared to singletons , sadly doubly as likely to be unsuccessful and are 4.3 times more likely to result in neonatal end compare with singleton gestation . ” They also have an increase chance of rise a disability .
monovular Twin often share a placenta . However , this share rip circulation can lead to duplicate - to - Gemini transfusion syndrome . In this term , during pregnancy , parentage flow from the “ donor ” similitude to the “ recipient ” Gemini . This reduced origin supply results in the donor twin often being anaemic and smaller than the recipient role Gemini , whose heart can be strained by all the supernumerary blood .
Gucci ’s Twinsburg showwas dedicatedto Creative Director Alessandro Michele ’s mother , Eralda and her identical counterpart , Giuliana . Inspiration for the name of their twintastic runway show may have come in from the city of Twinsburg , Ohio . On thefirst full weekendof August , the city hosts the Twins Days Festival : “ The Largest yearly gather Of Twins And Multiples In The World ” .
On its website , the festivalexplainsthat " Many research worker take advantage of a big number of twins at the festival to aid with their projects . enquiry activity might include occupy out surveys , accept your ikon take even cater DNA samples . "
