All people have diffrent types of DNA (exept 4 indentical twins) but the way that you be able to contrast your DNA and your siblings DNA in to see which one has more of a biological connection to the...
There is junk DNA or non-coding DNA. This DNA is the segment before the promoter of a different gene.
A common analogy of DNA is a twisted ladder.
No, mitocondrial DNA is for the cell and Nulear DNA is for your body.
the sequence is 98.9%-99% similar or so