Chromosomes are Inherited From Your Parents
One chromosome from each of your 23 pairs came from each of your parents. The two chromosomes of a pair (except for the sex chromosomes) contain the same genes, but the genes have small differences. Things like SNPs make each copy of a gene uniquely Mom's or Dad's.
Do you share more genes with your mother or your father?
Genetically, you actually carry more of your mother’s genes than your father’s. That’s because of little organelles that live within your cells, the mitochondria, which you only receive from your mother.
Mitochondria are the energy-producing factories of the cell; without them, a cell would not be able to generate energy from food.
The mother effect
Tissues that require a lot of energy, such as your brain and your muscles, have cells packed with mitochondria. Because all mitochondria you received come from your mother only, you are technically more related to your mum than you are to your dad.
Mixing DNA Keeps You Connected
Most people have 23 pairs of chromosomes for a total of 46. One of each pair comes from mom and the other from dad. This is why we are 50% related to our moms and 50% to our dads.
Of course our parents got their chromosomes from their parents. This is why you are about 25% related to each grandparent.
If this is all there were to passing on our DNA, then this is what a typical couple of generations might look like: