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what is the secret behind them
A zygote will grow to an embryo to a festus but how are there 2 festuses instead of 1?
Fraternal twins can be of the same or opposite sex and they don't have to look at all alike.
formed when two egg cells are fertilized; each egg by a different sperm so that two embryos are formed.
The two halves are genetically identical. Identical twins are usually of the same sex.
formed when one egg after being fertilized by one sperm, divides into two halves
form two separate babies and the twins develop attached to one another.
formed exactly like identical twins, but during the split, the embryo does not separate completely
Credits:
http://www.betterhealth.vic.gov.au/bhcv2/bhcarticles.nsf/pages/twins_identical_and_fraternal
http://pregnancy.about.com/od/pregnancy/a/Twin-Pregnancy.htm
http://science.howstuffworks.com/environmental/life/genetic/twin2.htm
http://en.wikipedia.org/wiki/Twin
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what is the secret behind them
Since twins are usually premature, they are more likely to have lower birth weights. Prematurity is associated with increased risk of a number of disorders, including jaundice.
The normal length of gestation for a single baby is around 40 weeks. However, gestation for twins, either identical or fraternal, is usually around 38 weeks.
This shorter time is due to the increased demands on the mother’s body, and the inability of the babies to receive all the nutrients they need in utero.
However the risks of them becoming conjoined twins are also the highest
I am a monozotic male twin
Male Monozotic(Identical Twins) are the rarest form of twins
Approximately one quarter of identical twins are mirror images of each other