system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Are all spermatozoids from a same "batch" genetically identical?

I was watching a video of a single spermatozoid being caried to the egg with the help of a "nanobot" and that got me wondering, if the nanobot picked any other spermatozoid would that make any difference in the outcome? Would it end up actually generating a completely different individual?
gpt
All sperm cells are genetically unique. Every person has a double set of chromosomes, while each sperm cell has only one set. When making sperm cells, the genes are reshuffled between the chromosomes in the double set, and then the double set is separated to get two single sets for two sperm cells. So each sperm cell gets randomly unique reshuffled genes. The same holds true for egg cells as well. Without this same parents would be getting same children all the time, but as we all know in reality siblings are different (with the exception of identical twins which are two or more individuals developed from a single fertilized egg cell). And this gene reshuffling is kinda the whole point of sexual reproduction (as opposed to, say, cloning).