There is a mystique associated with multiples. Twins and multiples are the subjects of much interest and attention. Although they have become more common in recent generations, they are still a relatively rare phenomenon. For every one hundred people you encounter, only three will be a twin, and much fewer can claim to be a triplet or higher-order multiple. Because of their scarcity, there are many misunderstandings about them. One of the most common misunderstandings is the cause of twins and multiples.
Causes of Identical and Fraternal Twins
Doctors confirm new type of twin born from one egg and two sperm | Reuters
Could it really be twins? Take our quiz to discover your chances of having twins—fraternal or identical. What are your chances of having twins? Well, on average, about 1. How many full-term pregnancies have you had including your current pregnancy? Were you breastfeeding another child during the time period when you conceived this one?
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Fraternal Twins vs. Identical Twins
Every parent of twins faces the question "Are your twins identical or fraternal? Many think that being identical twins refers to how twins look and not how they form. Take a look at the biology that determines the sex combinations that are possible with identical and fraternal twins. The terms identical and fraternal don't describe what the twins look like, but actually how they form. Identical monozygotic twins are always of the same sex because they form from a single zygote fertilized egg that contains either male XY or female XX sex chromosomes.
Fraternal twins each come from their egg and sperm. Identical twins are monozygotic, while Fraternal twins are dizygotic. Zygotic refers to zygote, the egg fertilized by the sperm that will develop into an embryo.