👉 A polysomic person has two sets of chromosomes, one from each parent. In other words, they have two copies of each chromosome, with some parts being inherited from both parents and others coming from each other. This is different from a trisomic person who only has one copy of each chromosome, as in a trisomy 21 for example. Example: A polycystic kidney disease (PKD) patient would have two copies of each of the seven cystic kidneys,
