Some people seem naturally funny, always ready with a clever joke or a witty comment. Others struggle to land a punchline.

In fact, identical twins only make up one-third of all twins. Identical twins derive from just one egg and sperm, whereas fraternal twins are the product of two eggs fertilized by two different sperm.

Not every pair of celebrity twins is as easy to identify as Mary-Kate and Ashley.

Disney's original adaptation of Erich Kästner's 1943 novel, Das doppelte Lottchen (published as The Parent Trap in ...

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 ...

Gisele Bündchen and her five sisters — Raquel, Graziela, Gabriela, Rafaela and her fraternal twin Patrícia — are the children of Vânia and Valdir Bündchen.

Counting On sibling Jedidiah Duggar and his wife, Katelyn Nakatsu, welcomed fraternal twin girls earlier this month.

The Stranger Things star is super close to his fraternal twin sister, Chloe, as evidenced on the pair's individual social media accounts, which features shout-outs to each other.

Read on to learn what you need to know about the heredity of having twins. What Causes Twins? There are two basic types of twins — fraternal (or dizygotic) and identical (or monozygotic) twins.

"Fraternal twins are not common—just 23 in every 1,000 births. However, typically, twins at least look related," mom Katelyn Cheo told Newsweek.

The 32-year-old fraternal twins both wore full-length black velvet gowns Monday night to the British Fashion Awards, dresses that call to mind Diana’s iconic 1994 “revenge dress.” ...

Counting On's Jedidiah Duggar and his wife, Katelyn Nakatsu, opened up about the upcoming arrival of their twin girls.