Practice question

Complete interference represents extreme case crossover suppression where formation one chiasma eliminates ability second chiasma to form nearby in same chromosome arm. Observable consequence zero double crossover progeny when interval small less than 10-15 cM, leading coefficient coincidence zero because observed DCO divided by expected equals zero regardless expectation magnitude. Interference calculation one minus zero equals one signifying 100 percent suppression. Condition arises from meiotic chromosome axis mechanics enforcing obligate crossover and even spacing via interference signaling. Over very short distances interference commonly approaches completeness, ensuring genome stability and proper disjunction.