The incidence of monozygotic twins is ______
1 in 20
1 in 200
1 in 80
1 in 250
Ans. is D. i.e. 1 in 250
- The frequency of monozygotic twins is relatively constant worldwide and it is 1 set per 250 births.
- Dizygotic twins are responsible for the wide variation in incidence especially due to Assisted reproductive technologies.
- This incidence is generally independent of race, heredity, age, and parity.