Bryan Kohberger—suspected of the 2022 murders of four University of Idaho students—will head into trial with key DNA evidence admitted to court, a judge ruled on Feb. 19.

Then, the DNA strand within each chromosome breaks in the exact same location, leaving two free ends. Each end then crosses over into the other chromosome and forms a connection called a chiasma.

The judge found that there was no constitutional violation as Kohberger allegedly “exposed his DNA to the public by leaving it on the sheath, thus forfeiting any reasonable expectation of ...