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Girl and boy twins

To support our nonprofit science journalism, please make a tax-deductible gift today. Female twins who shared a womb with a brother tend to get less education, earn less money, and have fewer children than girls who shared a womb with another girl, according to an analysis of hundreds of thousands of births over more than a decade. Researchers suspect the cause is testosterone exposure during fetal development, though the exact mechanism remains a mystery. Still, she cautions, a lot more work needs to be done to establish a causal link.

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The Real Deal on Raising Boy-Girl 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 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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Can Identical Twins Be Different Sexes?

The majority of twins are fraternal twins twins that look different from one another. Learn more about fraternal twinning, from how they form to how they relate to each other, as well as how they differ from identical twins. Zygotic refers to zygote, the egg fertilized by the sperm that will develop into an embryo and grow into a baby.

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.

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Names for boy/girl twins: photos

There's nothing more special than parading down the street with boy-girl twins in tow. The unending oohs and aahs of strangers may even help you forget the lack of sleep and shower you couldn't take that morning. Of course, there's a little or a lot of stress in the life of every parent of multiples. Raising twins isn't easy, and bringing up babies of different sexes can pose unique challenges that escalate at various stages of development. While every child is different, here are some common problems that come up with many boy-girl twins, and how you can address them: Little Miss Bossy Pants Yes, it's adorable and also predictable. Your little girl is developing faster than her twin brother and has taken the lead in lots of shared activities and games. This is something you want to watch out for," advises Dr. Pamela Varady , a clinical psychologist and mother of twins. She suggests parents teach their girl-boy twins that everybody's needs and ideas are important and valued. Joan A.

The Difference Between Identical and Fraternal Twins

In This happens when the fertilised egg 'loses' one of the copies of the Y chromosome when it is dividing into two embryos in very early development. The resulting babies are then male XY and female XO. The normal genetic make-up of a girl is XX. An XO baby is outwardly a girl, but her cells only have one copy of the X chromosome.

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Because fraternal, or dizygotic, twins are 2 separate fertilized eggs, they usually develop 2 separate amniotic sacs, placentas, and supporting structures. Identical, or monozygotic, twins may or may not share the same amniotic sac, depending on how early the single fertilized egg divides into 2. If twins are a boy and a girl, clearly they are fraternal twins, as they do not have the same DNA. A boy has XY chromosomes and a girl has XX chromosomes.

11 Surprising Facts About Fraternal Twins

I work four days a week at my salaried job and a whole lot more than that in my job as parent to three children. My two youngest are three year old twins, George and Alice, their older brother Thomas is six. Since that time, their needs have changed, personalities developed and their care has been shared between their parents and other caregivers including three different nannies at different times and now teachers at nursery school. My understanding of my children and my role as a parent has been challenged and changed many times and I hope these five lessons will be of interest to others.

SEE VIDEO BY TOPIC: Twin vs Twin Challenge

The mother of boy-and-girl twins and author of Twinspiration: Real-Life Advice from Pregnancy through the First Year , answers questions about her twins' personalities and behaviors. Of all the questions we're asked, this is the only one that really does provoke me. Largely because it is asked in the twins' presence! Sadly, many adults seem to think that if a child cannot speak, they cannot understand. My method of subtly "enlightening" the asker without resorting to overt condemnation is to physically bring the twins into the conversation.

Girls who share a womb with boys tend to make less money than those with twin sisters

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Apr 28, - I have girl/boy twins. Aside from discrepancies in their sleeping and eating habits, they were treated virtually the same for the first year of their.

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The Real Deal on Raising Boy-Girl Twins

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Parenting Twins: Personalities & Behaviors

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