In a three-point mapping experiment, which class do you expect to find the least?

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In a three-point mapping experiment, the frequencies of the classes are driven by how many crossover events occur between the loci. 
Option 1: noncrossover. This term refers to the class where no crossovers occur in either interval (essentially the parental type in many contexts). This class is typically among the most frequent, not the least, because it requires zero recombination events. 
Option 2: parental. This is another way to describe the nonrecombinant class (no crossovers in either interval) and is usually the most abundant class in three-point mapping experiments due to its lack of recombination events. 
Option 3: double crossover. This class requires recombination events in both intervals, i.e., two crossovers, which is statistically the least likely because it depends on two independent crossover events occurring in proximity. Therefore, its frequency is the smallest among the classes. 
Option 4: single crossover. A single crossover involves recombination in exactly one of the two intervals, which is more probable than a double crossover because it only requires one recombination event, making it more frequent than double crossovers but less frequent than the nonrecombinant/parental class. 
Putting this together, the class you would expect to find the least frequently is the double crossover, since multiple recombination events are comparatively rare compared to zero or a single event.

MOLGEN 4500E AU2025 (25000) Exam 4- Final Exam- Requires Respondus LockDown Browser

In a three-point mapping experiment, which class do you expect to find the least?

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