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Girl and guy twin sex

The majority of twins are fraternal twins twins that are more like siblings born at the same time than identical twins. Zygotic refers to the zygote, the egg fertilized by the sperm that will develop into an embryo and grow into a baby. Monozygotic twins come from a single egg and sperm that splits into two after conception. Because fraternal twins originate from separate conceptions, they can be boys, girls, or one of each just like a singleton baby. Chromosomes from the father's sperm determine gender: XX for a girl and XY for a boy.
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11 Surprising Facts About Fraternal Twins

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11 Surprising Facts About Fraternal 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.
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Can Identical Twins Be Different Sexes?

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. Fraternal twins, in which each of two eggs is fertilized by a different sperm cell, occur in about four of every births. About half of those result in male-female twin pairs.
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Back to Your pregnancy and baby guide. If you're pregnant with more than 1 baby, a healthy diet and lifestyle will help you cope with your pregnancy and give your babies the best start in life. The advice for keeping healthy in pregnancy is similar whether you're expecting twins, triplets or just 1 baby. Eat well, take gentle exercise, drink lots of fluid and, if you feel stressed, get support from friends and family or talk to your midwife.
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