👉 Monozygotic (MZY) is a genetic theory that suggests that humans and other primates are genetically identical, or monomorphic. This means that a child born to two parents will have exactly one copy of each chromosome from both parents, and there will be no duplication of any genes between the two parents. However, it's important to note that this concept is not universally accepted by all scientists and researchers in genetics, as some argue that it is possible for different sets of chromosomes to exist