Fraternal (Dizygotic) Twins:These are twins who developed from separate fertilized eggs. They're like two houses built from different blueprints - similar in some ways because they're both houses, but not identical.
Concordance Rate: This is a term used in genetics which indicates the percentage of cases where both twins express a certain trait if one twin expresses that trait. It's like comparing how often both houses need repairs if one house has a problem.
Clone: A clone is an organism or cell that is genetically identical to another. Like creating another house with the exact same blueprint as the first one.