Twin pregnancy occurs when a woman carries two fetuses at the same time. There are two types of twins: monozygotic (identical) twins, which develop from the splitting of a single zygote, and dizygotic (fraternal) twins, which develop from two separate eggs fertilized by two separate sperm. Monozygotic twins share the same placenta and have identical DNA, while dizygotic twins have separate placentas and are no more genetically similar than normal siblings. The document further details the development and characteristics of both types of twins.

1. Topic of presentation
TWIN PREGNANCY

2. PREGNANCY:
The period from conception to birth is
known as pregnancy.
OCCURANCE:
it occurs when an egg is fertilized by a
sperm and then implanted in the lining of uterus
Where it develops into placenta
At first it is known as embryo after that it is called
as Fetus

3. TWIN PREGNANCY:
twin pregnancy means a women
is carrying two fetus at a same time
TYPES:
there are two types of twins
1. Monozygotic ( identical twins)
2. Dizygotic (fraternal twins)

4. MONOZYGOTIC
-IDENTICAL
-Same placenta
-FERTILIZES BY
SINGLE OVUM
-SAME SEX
-SAME BLOOD
GROUP
DIZYGOTIC
-NOT IDENTICAl
-Separate
placenta
-FERTILIZED BY 2
OVUM
-DIFFERENT SEX
-DIFFERENT
BLOOD GROUP

6. MONOZYGOTIC TWINS :
 Monozygotic means “one zygote.”
 MZ twins develop when one
egg is fertilized by one sperm
to produce a single zygote.
 The zygote starts to develop
into an embryo
 but at some time during the first two
 weeks the developing embryo splits into
 two identical parts.
 Each part develops into a baby.

7. TYPES OF MONOZYGOTIC TWINS :
 Due to the arrangement of placenta and membranes it
is divided into 4 types
 These type depends on division of zygote
 MONOZYGOTIC twins have same placenta

10. DIZYGOTIC TWINS :
 These are always DICHORIONIC and DIAMNIOTIC
 Dizygotic means “two zygotes.”
 Two eggs are fertilized by two different sperms
 Forms 2 zygote
 These zygotes are implanted into
 uterus seperately