Knowledge: The is no difference between the amnion and chorion layers of the amniotic sac. Fraternal twins share about 50% of their genes, identical twins share nearly 100% of their genes.

Conversation:
Do you happen to know any twins?
I do not, do you? and would they be fraternal or identical twins?
No, I don't. Is there any difference between fraternal or identical twins?

Response: Yes, Identical twins share over 100% of their genes, but fraternal twins only share roughly 50%.