Question: is it more common to have twins of the same gender?
Answer: Chromosomes from the father's sperm determine gender: XX for a girl and XY for a boy. 2﻿ As a result, the chances of fraternal twins resulting in boys, girls, or a combination are the same as for any other baby. Monozygotic—identical—twins, on the other hand, are always the same gender, either two girls or two boys.