🧵 The Biology of Twins
Anonymous at Sat, 23 Nov 2024 15:37:05 UTC No. 16490511
First of all, I asks in a good faith and just want to discuss some question which arise during my readings for some other work.
According to some sources, Africa is the continent with the highest number of twin births, while Asia has far fewer twins[1] [2] [5].
The common explaination for this is that the age when women give their first birth is much higher in Asian than Africa [3]. Which makes a lot of sense today [4] but has the implication that, even back in the 1980s, Asian women should be older when they became mothers.
In this lense, my question is, how make it any sense that the number of twins rises worldwide according to some news? [6]
Is there any clear explaination, given this fact?
I'm also interested in the mechanism of dizygotic twins in the first place. How does it happend that younger mothers birth more twins than older ones?
[1] Countries With Most Twins Identified by Charles Q. Choi (2011)
https://www.livescience.com/16469-t
[2] Twin Peaks: more twinning in humans than ever before by Moden et al.
https://academic.oup.com/humrep/art
[3] Maternal Age and Parity as Predictors of Human Twinning by Bønnelykke.
[4] https://en.wikipedia.org/wiki/List_
[5] https://www.medicinenet.com/differe
[6] "Twin Peaks: more twinning in humans than ever before"
https://www.eshre.eu/Press-Room/Pre