If the division in the zygote occurs between 9-12 days after fertilization, which of the following twin is expected?
Show Hint
- Dichorionic diamniotic
- Conjoint
- Monochorionic diamniotic
- Monochorionic monoamniotic
The Correct Option is D
Solution and Explanation
If the zygote divides 0-3 days post-fertilization, dichorionic diamniotic twins are formed (two placentas, two amniotic sacs).
If division occurs 4-8 days, monochorionic diamniotic twins are formed (one placenta, two amniotic sacs).
If division happens 9-12 days, monochorionic monoamniotic twins are formed (one placenta, one amniotic sac).
If division happens after 13 days, conjoint twins (Siamese twins) may occur. Thus, the correct answer is Monochorionic monoamniotic (4), as division at 9-12 days results in a single amniotic sac and a single placenta.
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