1 year ago
Last edited at 8:36AM on 4/25/2012
Identical twins happen when a fertilized egg splits. There is no specific parent that has to cause that. Fraternal twins is when the mother has released two eggs and both get fertilized. Some families do have a higher number of twins running though them but it doesn't have to be hereditary.
1 year ago
Last edited at 8:52AM on 4/25/2012
It can be determined by either or both parents, as it is indeed hereditary. Not sure of the exact likelihood genes will incur: I think it is still quite a small chance, but it varies depending on the particular ancestry, like any genetic likelihood.
The above answer is referring to Identical twins only, the potential for Maternal twins isn't affected by either parents' genes but is highly likely when In Vitro Fertilisation(IVF) is used, in which case the decision of how many fertilised eggs being used will determine the likelihood of twins, triplets etc. The number used will usually be decided by the doctor, but the mother and father/partner could probably demand a lesser or higher number for use, though I doubt using more would be advisable.
a Russian woman had in 27 pregnancies 16 pairs of twins, 7 sets of triplets, and 4 sets of quadruplets and a total of 69 childern......okay it's not an answer to your question just thought you might be interested