Non-identical twins are uniquely separate people who simply happen to be gestating at the same time and place as each other. Non-identical twins form from two completely separate eggs that are fertilised by two utterly separate sperm. These fraternal twins are no more alike than any other siblings in a family with the same biological mother and father.
Because identical twins share the same genes, they’re invariably the same gender. however non-identical twins could also be the same gender or the alternative because they solely share five hundredth of the same genetic coding.
Some people still believe that the incidence of having twins skips a generation however this is not true.
What will increase the percentages of having non-identical twins?
Advancing maternal age. women who are aged in their 30’s and 40’s have considerably higher probabilities of conceiving with twins. young women, particularly those aged in their 20’s, don’t have as much probability.
Having assisted reproductive technology, in particular taking medication that will increase ovulation. This makes perfect sense as a result of the a lot of eggs that are supported towards maturity each month, and which are then released, suggests that the a lot of that are available to be inseminated.
The more pregnancies a woman has already had, the higher her probabilities of conceiving with non-identical twins.
If a woman is a fraternal-non-identical twin herself, if she has siblings who are fraternal twins or her mother/grandmother had fraternal twins, then she is more likely to as well.
Race – Black African women are more likely to have twins than women from any other ethnic descent.