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Grandparent to Grandchild DNA testing
There are 3 major testing options for Grandparent to Grandchild testing:
To establish whether or not particular grandparents and grandchildren are biologically related - Grandfather to grandson – Y Chromosome Test
Men have one Y chromosome, which is passed down to their son and then to their grandson. So testing the Y chromosome will show us If the grandfather and grandson are biologically related. - Grandmother to granddaughter – X Chromosome Test
The flow of X chromosome from mother to son to granddaughter means an X chromosome test is more applicable - Other possibilities
We can also test other regions of DNA other than X and Y in specific circumstances where the flow of either X or Y DNA is not applicable. A table with the grandparent to grandchild relationships is listed with the cost of each test.
Summary of X CHROMOSOME Testing Costs: Rs 0 for 3 people (Rs XXX for each additional person) :
Testing for paternity of a grandchild with a grandparent |
Must also have |
Better with |
Cost |
Grandfather to Grandson (Y chromsome test)* |
- |
- | Rs xxx |
| Grandfather to Granddaughter | Grandmother or Mother's DNA | both Grandmother and Mother's DNA | Rs xxx |
| Grandmother to Grandson | Grandfather or Mother's DNA | both Grandfather and Mother's DNA | Rs xxx |
| Grandmother to Granddaughter (X chromosome test)* |
- | Mother's DNA | Rs xxx |
*About Y chromosome DNA testing
To establish whether or not a grandfather and grandson are biologically related, Y-chromosome testing is your least expensive option, nevertheless obtaining a very high accuracy (99.9%+).
Every man has one Y chromosome (women have no Y chromosome). A father passes his Y chromosome to all his sons. Hence, a grandfather and grandson, if biologically related, will have the same Y chromosome DNA patterns.
*About X chromosome tests
To establish whether or not a grandmother and granddaughter are biologically related, X-chromosome testing is your least expensive option, nevertheless obtaining very high accuracy (99.9%+).
A grandmother will pass one of her X chromosomes to her son who will, in turn, pass that X chromosome on to his daughter. Hence, a grandmother and granddaughter, if biologically related, will have exactly the same X chromosome patterns.
