Approximately one percent of all pregnancies are twin
pregnancies. Approximately two thirds of all twin pregnancies are fraternal
twins. Fraternal twins are formed by the fertilization of two eggs from the
mother with two sperm from the father. Two fertilized eggs (zygotes) are
formed, so dizygotic (freternal, biovular, non-identical, soraral) twins are
called. Two zygotes develop individually to form two babies. Their genetic
structure is different. These are like two brothers born in different years,
only in the same womb at the same time.
Can They Be
Different Genders or the Same?
Because fraternal twins consist of two separate eggs and
sperm, like siblings born in different years, their sex may be the same or
different. They can be both girls or both boys, but most often one is a girl
and the other is a boy. Half of the fraternal twins are born this way, with a
different sex.
(In single pregnancies, males are more than females with very
little difference (about 5%).)
-WHAT SHOULD BE DONE TO HAVE TWIN PREGNANCY?
-IDENTICAL TWINS
-FRATERNAL TWINS
-TRIPLET PREGNANCY
-NORMAL BIRTH OR CESAREAN IN TWIN PREGNANCIES?
-TWIN TO TWIN TRANSFUSION SYNDROME
-CAN THERE BE TWIN BABIES FROM DIFFERENT FATHERS?
-CAN ANOTHER PREGNANCY OCCUR DURING PREGNANCY?
-VANISHING TWIN SYNDROME
-FETUS IN FETU (FIF)
-CHIMERISM
