What is Twin Zygosity Testing?
A twin zygosity test is a DNA test that definitively shows whether twins are identical or fraternal.
How is This Type of DNA Test Used?
The results of a twin zygosity test may be used to satisfy personal curiosity as well as to help solve future health problems. For example, in the event that a twin needs an organ or tissue transplant donor, the identical twin is a perfect choice. There are also cases in which medical records regarding zygosity have been lost, or doubt may have arisen because of the twins’ physical characteristics as they grow up.
In such cases only a DNA test will be able to reveal the truth. A twin zygosity test compares the twins’ DNA profiles to see whether they match. An exact match proves that the twins are identical.
What is the Cost For This Test?
A Twin Zygosity DNA Test for personal knowledge only costs $195. If you need a test for legal purposes, the cost is $295.
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What Is The Difference Between Identical vs. Fraternal Twins?
Identical twins come from one fertilized egg, called a zygote. The zygote, which usually develops into one child, grows and splits early in development to form two embryos-identical twins. Because the twins come from one egg and one sperm they have exactly the same DNA.
Fraternal twins develop when there are two different eggs in the mother’s womb that are fertilized by two different sperms. Fraternal twins will not have exactly the same DNA. Like other siblings they can be expected to share some of the DNA they inherit from both parents.