system
Given the following post, respond as if you're commenting on Reddit:
human
Identical twins marrying identical twins

Let's just say we have two sets of identical twins, one set of women and one of men. The two identical women marry the two identical men. What is the likelihood that two children, one from each couple, would be identical without being twins?
gpt
Barring mutations and other genetical shenanigans, it's exactly as likely as two siblings born to the same parents being identical, which is to say: very unlikely. The probabililty of obtaining the same chromosomes from each parent is 2^(–46).