If my my biological father is dead, can i use his fathers dna to determine if he was truly my father.?

Question

If my my biological father is dead, can i use his fathers dna to determine if he was truly my father.?

Answer 1

yes, i believe if that is your grandfather, then you all would have some type of similarity in DNA

Answer 2

Yes you can.

The Y chromosome,  is found only in men and is passed down unchanged from father to son just like a surname.  Any sons a man fathers will also carry this identical Y chromosome, making it easy to track through generations.   In circumstances where an alleged father is unavailable for testing or deceased, a male child can be tested against any number of his male relatives including, but not limited to, other known male children, brothers and half brothers with the same father, uncles, grandfather, and grandfather's brothers.  

Hope this helps.

Answer 3

yuppers

Answer 4

If you are a male or have a male sibling, you can take the Y-DNA test. You can use your biological father's brother, another son, or Uncle, though the closer you get to your biological father, the better.

If you are a female, then your DNA passes from Mother to Mother, and therefore it won't work.

Paternal Lineage and the Y-Chromosome

A male providing his Y-chromosome sample also represents the DNA of his father, paternal grandfather, and so on up the paternal line. Y-chromosome results are generally identical throughout the paternal line. But because mutations do occur, it is possible for a son's results to be slightly different from his father's or his brother's.

Women, in spite of not carrying a Y-chromosome, can still trace their paternal lineage. Using a DNA sample provided by a brother, father, or another paternal relative (for example, a male cousin) a woman can treat these Y results as if they were her own.

Females, as well as males, can discover their ancient maternal lineage through DNA testing. Because a father's mitochondrial DNA (mtDNA) is destroyed at fertilization, a child inherits only the mother's mitochondrial DNA, thus preserving the maternal link to the ancient past. Due to this unique inheritance pattern, both males and females may directly contribute a DNA sample for testing the maternal lineage.

Answer 5

If you are a male, yes your Y DNA would prove it.