Sally and tim were planning on starting a family. sally's extended family have several sets of dizygotic twins. when speaking with their doctor, sally asked what could cause her to have dizygotic twins. the doctor informed her that the likelihood of having dizygotic twins will be determined by

The answer is her genes.
Studies shows that Genetic played a really huge role in determining whether we could have fraternal twins (dizygotic twins)
The data shows that women who had relatives that produce dizygotic twins are 2.5 times more likely to produce dizygotic twins compared to women who do not.