What is the chance of fraternal twins of the same gender?

Chromosomes from the father's sperm determine gender: XX for a girl and XY for a boy. As a result, the chances of fraternal twins resulting in boys, girls, or a combination are the same as for any other babies. read more

Gender Chances with Fraternal Twins. The gender chances of a fraternal twin pregnancy are; 25% chance that a mother will have two boys, 25% chance that a mother will have two girls, and 50% chance that a mother will have a boy and a girl. On the other hand, identical twins are always the same gender. read more

Because fraternal twins originate from separate conceptions, they can be boys, girls, or one of each. Chromosomes from the father's sperm determine gender: XX for a girl and XY for a boy. As a result, the chances of fraternal twins resulting in boys, girls, or a combination are the same as for any other babies. read more

There a four possible combinations of gender here, and each occurs with a likelihood of 25%: Female/Female. Female/Male. Male/Female. Male/Male. The first and fourth together give you the 50% stated above. read more