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Identical twins boy and girl pictures

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 can be either two girls, two boys, or one of each.

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1,930 Boy Girl Twins stock pictures and images

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 can be either two girls, two boys, or one of each. These are the possible sex combinations:. Identical twins come from a single fertilized egg that splits into two.

Before it splits, it is either male or female. After it splits, there are either two males or two females. Identical twins have the same genetic origin. No direct cause of monozygotic twinning has been determined; it is not hereditary.

Monozygotic twins represent about one-third of all twins. The result is either two male twins, two female twins, or one male and one female. The genetic similarity between fraternal twins is the same as any two siblings about 50 percent if they have the same mother and father. They may look alike, or not, just like any sisters and brothers. Fraternal twins are the most common form of twins, representing about two-thirds of all twins.

Also, most twins and multiples that result from fertility enhancing treatments, such as drugs or procedures like in-vitro fertilization, are dizygotic rather than monozygotic. Every rule has exceptions, of course. In this case, they are extremely rare exceptions, and it's not likely that the average person would ever encounter twins in this situation. Note that there have been a few reported cases of a genetic mutation in monozygotic male twins.

For some reason, after the zygote splits, one twin loses a Y chromosome and develops as a female. It's extremely rare; less than 10 cases have been confirmed. Given the odds, it's safe to assume that While identical twins come from the same fertilized egg and share the same DNA combination, there are more possibilities for fraternal twins.

Besides being the offspring of two sperm and egg combinations, they may have different genetic donors. Here are the different combinations:. You are likely to have to answer the same questions about your twins repeatedly. Armed with a few facts about twins, you'll be able just to grin and bear it or enlighten the curious about the biology of twins.

Get diet and wellness tips to help your kids stay healthy and happy. More in Ages and Stages. Identical Twins. Fraternal Twins.

The Exception to the Twin Sex Rule. Genetically Dissimilar. View All. Was this page helpful? Thanks for your feedback!

Sign Up. What are your concerns? Article Sources. Verywell Family uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy. Turner Syndrome. Mayo Clinic. Twins, Triplets, and Other Multiples.

Office on Women's Health, U. Department of Health and Human Services. Related Articles. The Different Classifications of Unusual Twins. Amazing Facts About Identical Twins. Identical vs. Fraternal Twins Explained in One Picture. Causes of Identical and Fraternal Twins. Overview of Monozygotic Identical Twins. How Identical Are Identical Twins? And How Do They Form? Verywell Family uses cookies to provide you with a great user experience.

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1,702 Fraternal Twin stock pictures and images

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Can Identical Twins Be Different Sexes?

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SEE VIDEO BY TOPIC: Newborn Boy & Girl Twins Photographed in Studio with Ana Brandt

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