Find out everything you've always wanted to know about identical twins – from how they form to what makes them unique.

More importantly, she established that a person belongs to the gender they are “at conception.” If life begins at conception, ...

Cephalopods may have the oldest sex chromosomes of any animal, according to a new discovery in the octopus genome. That's a ...

One day, late in January, a friend and I watched two Steller sea lions swimming near Pt. Louisa. One of them held a front flipper high above the water for several minutes. We often see this behavior, ...

Researchers created the first bi-paternal mouse by modifying imprinting genes, advancing reproductive science but facing ...

Discover a study that explores the effectiveness of JAK inhibitors to treat dermatological autoimmunity for people with Down ...

Researchers have successfully engineered bi-paternal mice, born from two male parents, that survived to adulthood using embryonic stem cell techniques.

Yoko the swell shark was born in a habitat of all-female sharks who hadn't seen a male in years. The aquarium has two ...

Mice with two male parents that lived to adulthood have been created by stem cell scientists. But the genetically engineered ...

A team of stem cell scientists have successfully used embryonic stem cell engineering to create a bi-paternal mouse—a mouse ...