Identical (monozygotic) twins are always of the same sex because they form from a single zygote that contains either male (XY) or female (XX) sex chromosomes. Therefore, boy/girl twins are always fraternal or (dizygotic); they can only form from two separate eggs that are fertilized by two separate sperm.
Following
Sign up to join the largest storytelling community
or
Stories by Writer unknown
The good girl And the bad boy
She's the good girl that no one likes, her brother doesn't even care for her. But what happens when her crush...
Promise
What happens when Caden returns home and is welcomed with the surprise of his mothers cancer but also a surpr...