Other
Better Health Channel: Identical and Fraternal Twins
The Better Health Channel of Victoria, Australia, offers information on twins. Factors that increase the odds of having twins, how different types of twins originate, possible birthing complications, and zygosity testing are covered.
Khan Academy
Khan Academy: How Similar Are the Personalities of Twins?
Practice for the MCAT with these questions based on the given table showing the results of a report related to personality.