GeneTree DNA Twin Zygosity This test option enables you to test twins for either identical or fraternal relationship in 7-10 business days. At-home DNA specimen collection is as easy as swabbing the inside of your cheek.

Product Home Page Features & Benefits Symptoms & Conditions Other DNA Genetics Tests Test Medical Symptoms Home Page Discontinued Not for sale

GeneTree DNA Twin Zygosity Home Page

• Accuracy/Reliability greater then 90%
• LOW COST SOLUTION
• Results in 7-10 days
• SIMPLE: At-home specimen collection
• EASY: Just swab the cheek
• Advanced DNA technology

Twin siblings can either be ‘identical’ or ‘fraternal’. Zygosity refers to the genetic relationship between twin siblings. GeneTree'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 DNA Zygosity 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 7-10 days after specimens have reached the laboratory.

The following related DNA tests are available to better handle your situation if necessary: 

1.) GeneTree DNA Full Siblings determines if two people are genetic full siblingsl
2.) GeneTree DNA Half Siblings determines if two people are genetic half siblings
3.) GeneTree DNA Full/Half Siblings (Additional) enables you to test an additional sibling whether it be a full or half sibling
4.) GeneTree DNA Full/Half Siblings (Legal Collection) enables you to request the GeneTree customer service department to schedule the location and time to collect specimen samples for each person being tested for legal purposes.
5.) GeneTree DNA Full/Half Siblings (Legal Notarized) enables you to request GeneTree to notarize the lab results for legal purposes.
6.) GeneTree DNA Special Specimen Collection Kit enables you to perform a GeneTree DNA test using other types of biological specimens.

*   Same day and next day shipments are normally the case with the exception of any out-of-stock items.
** Lifetime member discounts are subject to member terms & conditions. Also, use of this site & products sales that result from this site are subject to our  company's policies & disclaimers