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Can there be opposite gender twins?
In 99.9\% of cases boy/girl twins are non-identical. However, in some extremely rare cases resulting from a genetic mutation, identical twins from an egg and sperm which began as male (XY) can develop into a male / female pair. The resulting babies are then male (XY) and female (XO).
What are twins that are opposite?
When twins have opposite features from their sibling, they may refer to themselves as mirror twins. Some examples of mirrored features include: birthmarks. freckles.
Can twins be born at different times?
The twins were born 11 weeks apart. Such a long interval between twins is rare, but not unheard of. (The world record — twins born 87 days apart — was set in 2012). But it’s not just the separate birthdays that set these twins apart — it’s the fact that each one gestated in a separate womb.
Can a human have twins with different fathers?
In rare cases, fraternal twins can be born from two different fathers in a phenomenon called heteropaternal superfecundation. Although uncommon, rare cases have been documented where a woman is pregnant by two different men at the same time.
Which twin is the oldest?
Marie and Gabrielle Vaudremer turned 101 on Oct. 2. The twins were born in 1910 and are the world’s oldest pair of twin sisters, according to the Guinness World Records.
What should I eat to have twins?
Although there can appear to be a pattern in some families of this happening, the odds of having identical twins is the same for every woman. Eating a diet which is high in dairy foods, milk and meat is said to help, especially at the time of ovulation.
Are identical twins always the same?
Identical twins are not EXACTLY the same (ever). Identical twins are created when one fertilized egg splits into two embryos, and in rare cases, this can produce opposite gender, but “identical” twins. Usually this occurance happens when there is a genetic defect in one or the other twin.
Can a woman give birth to twins from two different women?
Eggs from two women: A woman may carry twins conceived in-vitro with donor eggs, which could come from two different women. If they are fertilized by sperm from the same man, the twins would be half-siblings. Two women and two men: Donor eggs from two different women could be fertilized by sperm from two different men.
Can boy and girl twins stem from the same fertilized egg?
However, in extremely rare cases, boy and girl twins can stem from the same fertilized egg. Twins, who stem from the same fertilized egg, are called monozygotic twins. Washington State Twin Registry stresses that it’s an extremely rare event as only a handful of cases have been reported in the medical literature.
How do monozygotic twins become identical?
Through a complicated series of events, this zygote could result in the birth of monozygotic twins who are male (XY) and female (XX). These twins would be genetically identical except for their sex chromosomes.