Macrodeletion
Macrodeletion is like your chromosome got hit by a bus. It’s not a little chunk that’s missing, it’s a whole chunk, and your math test looks like it went through the same thing.
My chromosome got hit by a bus. I’m now a band kid with a broken chromosome and a failed math test.
My DNA got hit by a bus. That’s macrodeletion, baby.
My brother’s genes got hit by a bus. He’s now a band kid with a broken chromosome.