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This is a science project on twins.

twins hill

on 2 March 2011

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Transcript of Twins

Twins Fraternal Identical Identical twins are a result of one sperm fertilizing one egg. Soon after fertilization the embryo may divide into two(or more) genetically identical embryos. These becomes identical twins. Fraternal twins are the result of two different sperm fertilizing two different eggs(some women ovulate more than one egg per cycle)fraternal twins share no more genes than any other pair of siblings What would increase the chance of having twins? A women would have a greater chance of having twins if:
She is more then 35 years old
She takes fertility drugs
She has twins in the family
If you have already givin birth to twins your chances of having twins again quadruples
If a women has been on a birth control for a long time and suddenly goes off it they have a higher chance of having twins Facts about Identical Twins Facts about Fraternal Twins Identical twins share 100% of their DNA- Which means they will share sex appearnce
Identical twins are also called monozygotic twins
Identical twins share a placenta Fraternal twins share 50% of their DNA and unlike identical twins do not necessarily look similar in apperance
Fraternal twins sometimes are referred to as dizygotic or nonidentical twins
Fraternal twins have their own placenta Conjoined
A pair of identical twins born with their bodies joined at some point, a result of the incomplete division of the ovum from which the twins developed.
Facts about conjoined twins There are almost a dozen types of conjoined twins, two of the most common types Thoracopagus and Omphalopagus
Thoracopagus share the same heart and are connected at the upper portion of the torso
Omphalopagus are connected from the breast bone to the waist
They may share liver, gastrointestinal or genitourinary functions, but rarley ever share a heart
Rarest type is Craniophagus
They are joined at the head
Thoracopagus twins make up about 40 precent of all conjoined cases
33 percent are Omphalopagus
Only 2 percent are joined at the head Irish Irish twins are two children that have the same mother and are born in the same year or twelve months apart. Facts about Irish twins Not very common
Are not actual twins
People use the term Irish because Irish families used to have lots of children usually close in age
People believe this is because of a lack of birth control
A group of siblings born from the same gestation
Gestate means "to carry in the womb during the period from conception to delivery" Facts about twins A single baby is in the womb for around 40 weeks
Identical or fraternal twins are usually in the womb for around 38 weeks
This is because of increased demands of the mother's body and the inability for the babies to recieve enough nutrients they need to survive
People usually say the twins are usually born premature
This means the twins have a lower birth weight
Being premature is associated with a increased risk of a number of disorders

It is very difficult to tell at birth if twins are identical or fraternal
Identical twins are sometimes born with individual membranes
This may lead to people mistaking them for fraternal twins
One way to tell the difference is by DNA testing
Black women have the highest chance of having twins and Asian women have the lowest chance of having twins Famous conjoined twins. Joined together by a small band of cartilage at the sternum Their livers were fused but were each independently complete
Through practice they were able to stretch the tissue that connected them and stand side-by-side rather than facing one another
The term Siamese twins originated from Eng and Chang who gained international fame shortly after leaving Siam as teenagers
The term " siamese twins" is not used anymore because there is conjoined twins all over the world
People believed Chang died of a blood clot and Eng died 3 hours later from shock seeing his brother dead when waking up
They died on January 1874 The end
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