DNA Testing Twin Zygosity
Twin siblings can either be ‘identical’
or ‘fraternal’. Twin Zygosity
refers to the genetic relationship between twin siblings. IDENTIGENE's
DNA testing services are used to help determine if twins are either
fraternal or identical.
Identical Twins
When one egg is fertilized by one sperm cell,
and then divides and separates, two identical cells will result.
These cells will then develop into identical twins. The DNA profiles
for identical twins will be identical. Additionally, the physical
attributes of identical twins will seem similar for traits such
as hair color, hair texture, eye color, height, and weight. They
must also be of the same sex.
Fraternal Twins
When two eggs are independently fertilized by
two different sperm cells, fraternal twins result. The DNA profiles
for fraternal twins will not be identical, and they are just like
full-siblings that are born at different times. Furthermore, if
the two sperm cells originated from 2 different men then the twins
would be like 2 half-siblings. Additionally, the physical attributes
of fraternal twins may not seem similar for traits such as hair
color, hair texture, eye color, height, and weight. They also
may not be of the same sex.
The Twin
Zygosity DNA Test is used to establish DNA profiles
for the twins being tested. If the profiles are different, then
the twins are fraternal, and if the profiles are identical then
a probability of being identical twins is calculated. Results
are available in 7-9 days after specimens have reached the laboratory.
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Twin Zygosity DNA Test
Kits for only $195
Determine if twins are identical or fraternal. We'll send a DNA collection kit directly to your home.
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