Practice question

Interference concept quantifies how one chiasma formation influences probability another nearby during synaptonemal complex formation. After measuring coefficient coincidence C = observed DCO / expected DCO, interference I = 1 - C converts coincidence into suppression metric ranging zero to one. C values near one produce I near zero meaning no interference, crossovers random and independent. C near zero produces I near one complete suppression where second exchange prevented. Negative interference where I negative indicates excess double crossovers occasionally seen near chromosome ends or in mutants.