The new study uncovers a potential factor that may shape the X chromosome's influence. Related: 1 in 500 men may carry an ...

Jake Burger will wear No. 21 with the Rangers to honor his daughter who was born with Down syndrome, which has the clinical name of trisomy 21.

Based on his observations, Henking hypothesized that this extra chromosome, the X element, must play some role in determining the sex of insects. However, he was unable to gather any direct ...