6. Zygosity
Twins come in two forms:
Monozygotic – a single fertilized egg that splits –
Also called “identical”
Dizygotic – two separate eggs that gestate
together – also called “fraternal”
8. Only Their Mother Can Tell Them
Apart?
Epigenetics: different genes become “activated”
Environmental/Experiential Differences
– Experiences in utero
– Caretakers’ influence
– Life experience