And you, do you know the difference between twins and twins?

Written by: Dra. Rocío Núñez Calonge
Edited by: Anna Raventós Rodríguez

Multiple pregnancies are a particularly interesting type of gestation, both for science and for the rest. They are especially common in Assisted Reproduction. But what is the difference between twins and twins?


  • Dizygotic twins or twins can come from 2 oocytes and 2 different spermatozoa, so they give rise to 2 siblings who have different chromosomes, sometimes even different sex.
  • Monozygotic twins are born in a single ovum and spermatozoon, so we will have an identical genetic load, of the same sex and physically very similar.



On the other hand, depending on the moment of the separation, we can have one or two placentas, one or two amniotic sacs ... the most extreme case being that of the Siamese (which is when the separation is even later).


For more information consult a specialist in Assisted Reproduction .

*Translated with Google translator. We apologize for any imperfection

By Dra. Rocío Núñez Calonge
Fertility Specialty

Dr. Núñez Calonge is a leading embryologist who practices in Assisted Reproduction since 1985. He is responsible for the Laboratory of Andrology, Embryology and Sperm Bank of Tambre Clinic, of which he is assistant director. He is an international consultant for Assisted Reproduction Centers, is a member of various scientific committees and coordinates the Group of Ethics and Good Clinical Practice Spanish Fertility Society. He combines his professional practice with his role as a teacher.

*Translated with Google translator. We apologize for any imperfection

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