![]() ![]() Twins with Different FathersĪlong the same lines of twins conceived at different times, it is also possible for fraternal twins to have two different fathers. Typically, the date and size difference is slight, however, your doctor may be able to confirm this phenomenon with an ultrasound. Known as superfetation, this extremely rare type of twin happens when either ovulation occurs more than once in a cycle or a person has a double uterus. When this happens you can end up with non-identical twins conceived days or even weeks apart. Sometimes, two eggs release at separate times in the menstrual cycle. When two eggs drop at once, it can cause fraternal twins. While fraternal twins are fairly straightforward, there are a few uniqe and rare subtypes. What are the different types of fraternal twins? This gene also increases your chances of having multiple sets of twins. In other words, even if twins run in the father’s family, the chances of having twins increase only if fraternal twins also run in the mother’s family. This gene passes from either the mother or the father but it will only affect a woman’s chances of having multiples. And, while a family history of fraternal twins can increase your chances of having twins yourself, it’s due to the inheritance of the gene that causes hyperovulation, not just the repeated occurrence of twins. What kind of twin is hereditary?ĭespite the common belief that all twins run in families, so far science has proven that only fraternal twins are hereditary. This is partially due to increased reproductive assistance tools, such as in vitro fertilization, in which more than one embryo is often implanted. They can be any combination of gender: boy-boy, girl-girl, or girl-boy. Research shows that boy-girl combos are the most common, accounting for 50 percent of all di-di twin pregnancies.įraternal twins have increased substantially over the last 30 years. These multiples share about 50 percent of their DNA, the same as non-twin siblings. What are the most common types of twins?ĭizygotic (fraternal) are the most common type, accounting for two-thirds of all twin births. Your doctor will perform an ultrasound in the first trimester to determine which type of twins you are having. Knowing which type of multiples you are carrying is vital as identicals carry higher risks for complications such as Twin-to-Twin Transfusion Syndrome. Monozygotic (identical) twins occur when one sperm fertilizes one egg and within 3-15 days the egg splits in two, resulting in identical twins. Monozygosity usually leads to monochorionic twins, meaning they share a placenta. ![]()
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