The two most common types of twins are dizygotic (fraternal) and monozygotic (identical). Learn more about them and what may possibly cause multiple births.

Fraternal or dizygotic twins develop from two different eggs fertilized by separate sperm; they generally share about 50 percent of their genes. Therefore, fraternal twins are essentially like ...

The students are all fraternal twins — meaning born from different eggs and sperm — so none of them are identical. Many of the twins are also different genders.

My twins applied to the same colleges with similar achievements. I don't understand why one got $13,000 more in merit scholarships.

Conjoined twins are twins who are born physically attached to each other. Learn more about what causes this condition, what to expect, and more.

Identical twins may be born the same but live in vastly different worlds. Reproductive and hormonal differences Even reproductive health can differ between twins.

Among the nearly 500 students in Plainview-Old Bethpage John F. Kennedy High School’s graduating class, in Long Island, New York, 30 of them are twins.

The students are all fraternal twins — meaning born from different eggs and sperm — so none of them are identical. Many of the twins are different genders.

Many of the twins are different genders.That doesn’t make the bonds any less tight, says Bari Cohen, who is attending Indiana University in the fall.“Especially for boy-girl twins, a lot of ...