In theory, if you have enough kids, would they start genetically repeating?

Question

If you get 50% of dna from each parent, and there’s a finite amount of dna in each one, in theory, if you had enough kids (an impossibly large quantity) would your kids eventually be genetically identical to previous kids? Would the possible number of dna combination end eventually?

In: 20

Answer 1

You have 23 pairs of chromosomes. Each pair comes half from one parent and one from the other, so there’s four possibilities for each pair.

That would mean 4^23 or about 70 trillion possible combinations. The probability of having two kids with identical genes is so small it might as well be zero, unless they are identical twins.