Not syncing7. Which of the following best explains the development of twins?a. In the case of both identical and fraternal twins, the placenta and chorion may be shared, but it is very rare for both the placenta and the amniotic sac to be shared.b. In the case of fraternal twins, each fetus usually has its own placenta, chorion, and amniotic sac. Identical twins may each have their own placenta, chorion, and amnioticsac. In some cases, they share the placenta and the chorion; it is very rare for both the placenta and amniotic sac to be shared.c. In the case of both identical and fraternal twins, each twin has its own placenta, chorion,nd amniotic sac.d. In the case of fraternal twins, each fetus usually has its own placenta, chorion, and amniotic sac. Identical twins share the placenta and the chorion, and sometimes theamniotic sac.田

The gestation period varies for twins and a single baby by around 2 weeks. The single baby is usually born in 40 weeks whereas the twins are generally born in 38 weeks. Due to advancement in technology for reproduction, the mothers can give rise to multiple babies and also the mother’s age on average has increased. Twins are generally categorized based on the number of eggs from which they develop or whether they share a placenta in the womb of the mother. There are 2 main types of twins, namely identical twins & fraternal twins. The correct option is: In the case of fraternal twins, each fetus usually has its own placenta, chorion, and amniotic sac. Identical twins may each have their own placenta, chorion, and amniotic sac. But in some cases, they share the placenta, chorion but it is very rare for both the placenta and amniotic sac to be shared. When the ovaries of a woman release two eggs & each of the eggs are fertilized separately by two sperms, the twins so developed are known as fraternal twins. The embryos so formed then implant in the womb separately forming separate placentas & umbilical cords. These twins are generally known as dichorionic twins. 1% of identical twins are known to share a single placenta & single sac. The condition is very rare and is known to carry significant risk to the life of the twins. This is because, with the sharing of the placenta & sac, there occurs unequal distribution of blood flow & nutrition. This results in altered growth between the two fetuses.