There are two primary types of twins, Identical and Fraternal.
Identical twins occur when the egg splits after fertilization. To date no indication of a genetic link has been found. Anyone has a chance, though small, of having identical twins.
Fraternal twins occur when more than one egg is dropped during ovulation. This trait can be inherited from the mother's side of the family. Studies have shown that the chances are also increased by being overweight or older.
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Twins can be genetically identical (monozygotic) or fraternal (dizygotic). For fraternal twins, the mother's genetics determine if she releases more than one egg during ovulation, which can result in fraternal twins. For identical twins, the splitting of the fertilized egg is a random event and not influenced by either parent.
The mother will determine if there are fraternal twins. Fraternal twins are caused by the mother letting two eggs down the tubes at once.
Identical twins are caused by the fertilized egg splitting into two embryos. Why this occurs no one has figured out.
You inherit your DNA from both of your biological parents. Half of your DNA comes from your mother, and the other half comes from your father. This genetic material combines to determine your unique characteristics and traits.
If identical twins have the same DNA, it would be impossible to determine which twin is the biological father based on genetic testing alone. In such a case, additional evidence or alternative testing methods would be needed to establish paternity.
Yes, they are twins. Being born on the same day to the same parents makes them twins, even if they are identical.
They can share some DNA, since your mother/father was involved in them.
Genetics do not make a baby, they determine whether the baby will be more like the father or mother. Genetics can help determine traits like a baby having hair or eye colour like the mother.