New Texas Ranger Jake Burger will wear No. 21 this season. The number is for his daughter, Penelope, who was born with Down syndrome. Down syndrome is also known as trisomy 21, due to an extra copy of the 21st chromosome.

The clinical name for Down syndrome is trisomy 21, a condition in which a person is born with an extra chromosome, causing mild to moderate cognitive disability, developmental delays and physical challenges.