Approximately one percent of all pregnancies are twin
pregnancies. One third of all twin pregnancies are identical twins. Identical
twins, just like in single pregnancies, are formed with an egg from the mother
and a sperm from the father. Sperm and egg merge and fertilization occurs, one
fertilized egg (zygote) is formed. So far, everything is as in singleton
pregnancies. A certain time after fertilization, the fertilized egg is divided
into two and two separate embryos begin to develop. This division causes twin
pregnancy.
Are
Identical twins always similar? How about their sex?
Identical twins are the same as everything, including all
genetic structures, as they are formed by dividing a single egg into two. For
this reason, the images are always exactly the same. Their gender is always the
same. However, due to environmental factors, some features of identical twins
living in different regions develop differently. Different environmental
features, different feeding habits cause activation of different genes.
Identical twin race does not differ between races and
communities. Unlike fraternal twins, it is not affected by any factors such as
having twin pregnancies in the family.
Are
fingerprints the same?
Identical twins or fraternal twins' fingerprints will not be
the same.
Ultrasound
images:
- In identical twins, the placenta can be a common one or two
separately. The amnion sac, that is, the water sac that the babies are in, may
be common or separate. It is when the fertilized egg is divided.
- If division occurs within 3 days after fertilization, a
separate amniotic sac and chorionic membrane are formed, double placenta is
formed (such as dichorionic, diamniotic, Fraternal twins).
- If the division occurs between 4-8 days after fertilization,
the placenta and chorion layer become one, the amnion becomes two
(monochorionic diamniotic). The most common type is monochorionic diamniotic
development, 60-70% of monozygotic twins.
- If the division is between 9-13 days, all sacs develop
jointly, both babies within the same sac and single common placenta
(monochorionic monoamniotic).
- If the fertilized egg divides after the 13th day, the
condition called conjoined twins occurs. Apart from this, they may be attached
to each other from the head region, navel region, breech region, chest region.
- In monochorionic monoamniotic twin pregnancies (called
mono-mono briefly), the risk of cord entanglement and related intrauterine loss
is high.
-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
