Not exactly. Everyone gets more than 50% from their mother & less than 50% from their father. You only get mitochondrial dna from your mother.
Some people have some degree of trisomy’s and often the second copy is inactivated to some degree. Translocations occur. Transpositions. Inversions.
It used to be assumed that mosaicism was rare. Now the thinking is that most people have some small degree of it. There are genetic mutations in most everyone, including identical twins.
I’m sure there’s other things that don’t come to mind immediately.
