I was asking me something weird, and I thought you might validate or not my theory.
Hypothesis: A brother and a sister have one chance over 78 billions to clone one of their parent if they procreate
Here is my method:
I have 23 chromosomes from my mother, and 23 from my father. My father has
23 * 23 = 529 combinations of chromosomes in his "gametes". If my experience is willing to work, I need to have the exact opposites of my father chromosomes than my sister ones. That means that we can't have any of my father's chromosome in common with my sister. That makes approximately
1/529 * 1/529 = 1/279 841.
Then, if I decide to procreate with my sister, our child needs to have the 46 chromosomes back from my father. So the computation stays the same and I will have 1 chance over 279 841 to make it so.
1/279841 * 1/279841 = 1/7.8*10^10
My question is: Is my theory valid? If not why? If yes, that will make a hell of a story at parties...
Thank you for your scientific answers and have a nice day!