Early development of an embryo is solely supported by maternally deposited RNAs and proteins until its own genome is activated through a process called zygotic genome activation (ZGA). Recent research ...
Researchers confirm using zebrafish that if a certain gene is not excluded when vertebrate embryos are developing, the notochord will not elongate properly, resulting in a shortened form.
This led researchers to conclude that many fertility clinics, to increase success rates, continue to transfer more than one embryo in a single transfer cycle, to the detriment of mothers and children.