You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Least common type of twins- and explain in detail?
Ans. is d i.e., Conjoined twins Dizygotic twins 180%) o Result from fertilization of two ova, most likely ruptured from two distinct Graffian follicles usually from same or one from each ovary, bye two sperms during a single ovarian cycle. Monozygotic twins (20%) o Twinning may occur at different periods after fertilization. On rare occasion following possibilities may occur Diamniotic-dichorionic or D/D {30%):- if the division takes place within 72 hrs after the fertilization (prior to morula stage) resulting embryo will have two separate placenta, chorions and amnions. Diamniotic-monochorionic or D/M (66%):- if the division takes place between 4th & 8th day after the formation of inner cell mass when chorion has already developed. Monochorionic-monoamniotic or M/M (3%):- if the division takes place after 8th day of fertilization when amniotic cavity has already formed. 4) Conjoined twin or Siamese twin (<f %):- if the division takes place after 2 weeks of development of embryonic disc.