Monochorionic monoamniotic twins occur when splitting of zygote occurs:: (A) At bilaminar germ disc stage, (B) At 8 cell stage, (C) At 2 cell stage, (D) At early blastocyst stage
Answer is D. Ans. is d, i.e. At early blastocyst stageMonochorionic: Monoamniotic twins are seen when division occurs at more than 8 days which means Blastocyst is formed we all know Implantation occurs in stage of blastocyst and implantation begins by 6 to 7 days after fertilization and is completed by 10th day after fertilization. Hence between this time the stage is Blastocyst.