Question 1
Jane and Jill are monozygotic twins. Therefore, they:
◦ share the same physical traits
◦ are no more alike than any other two siblings
◦ developed from two separate ova fertilized by two separate sperm
◦ have been raised in different environments
Question 2
John (a boy) and Jill (a girl) claim that they are twins. You would know for certain that:
◦ if they are twins, they are monozygotic twins
◦ if they are twins, they are dizygotic twins
◦ if they are twins, John was born first and Jill was born second
◦ they could not possibly be twins