identical twins different sexes

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Pamela Prindle Fierro is the author of several parenting books and mother of twin girls.

Joel Forman, MD, is a certified pediatrician and professor of pediatrics, environmental medicine and public health at the Mount Sinai School of Medicine.

Every parent faces the question "Are you identical or fraternal twins?" When you are a pair of twin boys and girls, the answer is easy, but people do not always realize it. Many think that being identical twins twins refers to how visible and how they are formed. , Look biological sex determines the possible combinations with identical and fraternal twins

Boy / girl twins are always fraternal or (); they can only be formed from two separate eggs are fertilized by two separate sperm.

The terms are not identical and fraternal twins describe what it looks like, but actually how they are formed.

Identical () twins are always of the same sex as they are formed from a single zygote (fertilized eggs) which contain both male (XY) or female (XX) sex chromosomes.

can be two girls, two boys or one of each. It is the combination of sex might be:

Identical twins originate from a single fertilized egg that splits into two. Before the split, it is either male or female. After the split, there are either two men or two women. The second part of the fertilized egg implants in the uterus and each produces one of the twins.

Identical twins have the same genetic origin. There is no direct cause of monozygotic twins have been determined; it is not hereditary. monozygotic twins represent about one-third of all twins. They may look very similar, and it may be difficult to.

Fraternal twins are two individuals genetically unique because they are derived from two separate eggs are fertilized by separate sperm. The combination of egg / sperm produced can be male or female. The result is either two twins male, two female twins, or one male and one female.

The similarity between fraternal twins are genetically the same as the two siblings (about 50 percent if they had the same mother and father).

They may look the same, or not, just like brothers and sisters. fraternal twins are the most common form of twins, representing approximately two-thirds of all twins.

dizygotic twins and can be hereditary. Also, most twins and multiples the result of increasing fertility treatments, such as drugs or procedures such as in vitro fertilization, which dizygotic than monozygotic.

Every rule has an exception, of course. In this case, those exceptions are very rare, and it is unlikely that the average person will never experience the twins in this situation. Note that there has been no reported case of multiple genetic mutations in children monozygotic male twins. For some reason, after the split of the zygote, one twin lost the Y chromosome and develops as a female. Female twin would have Turner syndrome, which is characterized by short stature and lack of ovarian development. It is very rare; less than 10 cases have been confirmed. Given the possibility, it is safe to assume that 99.9 percent of all boy / girl fraternal twins.

While identical twins come from the same fertilized egg and share the same DNA combination, there is more likelihood of fraternal twins. In addition to being descendants of the combination of sperm and egg, they may have a different genetic donor

Here are the different combinations.

You may have to answer the same questions about your twins repeatedly. Armed with a few facts about the twins, you will be able only to grin and bear it or lighten want to know about the biological twins.

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