So I did the math regarding this a while ago. Of the 36,953 alleles your father possess you inhereted either 18,106 if genetically male, or 18,847 if genetically female, this is because the X chromosome contains 804 genes, while the Y chromosome contains only 63 genes. Now recombination isn’t entirely random, based on the location of the gene on a chromosome certain genes will almost always recombine together but I’m just going to use the simplest math I can to explain the point. This means that of the 18,043 genes that do not come from sex chromosomes, and therefore undergo recombination you have 2^18043 possible combinations. So that means that from the genetic material from your father you have 2^18044 possible combinations of genetic material. From your mother? That number actually goes up to 2^18847 because your mother has two X chromosomes that can recombine.
This means that the chance of your sperm that made you being present was only 4.10E-5420% the chance of the ovum that gave rise to you even making it to puberty much less being fertilized? 9.22E-5665%
Total chance of you existing? 3.78E-11088%
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