With DNA results of a 23me testing for DNA I show 54.1 and 46 segments of DNA with brother, do we have same father?

Question

I recently took a DNA test through 23me and results from a brother were 54.1 and 46 segments shared n genomes. He does not show on the paternal side of this testing, can anyone tell me if we share the same father from this results in the DNA testing. It was not a specific paternal testing and I really don't understand DNA testing,

 

Answer 1

Sherry,

 

If you and your tested brother has the same father than three of you would have certain number of similar fragments, these fragments would represent autosomes from your father that you and your brother are likely  to inherit.

 

You and your brother would not inherit 100%  same autosomal segments from your father but there would be a certain percentage that would show same pattern.

 

In addition, your brother would show the same Y chromosome fragment/complement as yours and his father.

 

As Hafid pointed, I am not sure what those number imply.

 

I hope this helps.

 

 

Answer 2

hi Sherry,

 

Could you tell me a little more what the 54.1 and 46 numbers mean.  Is this percent shared segments?  

I'm not sure what you mean by "n genomes"

 

Being female, your father would have passed the X chromosome to you and the Y chromosome to your brother.  This represents "sex" chromosomes.  Females have 2 X chromosomes and males have an X and a Y.  Humans have 46 chromosomes (23 pairs).  22 pairs (or 44 chromosomes) are not "sex" chromosomes; one chromosome of each pair of the 22 would have randomly been passed from a parent to a child.  

 

Your genetic report may have included probabilities based of certain sequences (might be so-called markers like "single nucleotide polymorphisms" or others) that represent the likelihood that you share an ancestor with another person.  That is something that would come from the lab.  Be sure to check with 23andMe.  They should have standardized numbers that could help answer this question.  

 

I hope this helps a little