Using only two genes at a time in recombination mapping, the maximum map distanc

Question

Using only two genes at a time in recombination mapping, the maximum map distance that can be calculated is 50 map units. Why is this?
a) There are as many even-numbered double crossovers as here are odd double crossovers at 50 map units or greater
b)there is no way to collect enough data to accurately map distance beyond 50 map units
c)no chromosome is more than 50 map units long
d)if you map more than 50 map units you are studying genes on different chromosomes
e) genes at 50 map units lie directly adjacent to each other so that there are not any more crossovers between genes

Explanation / Answer

a) There are as many even-numbered double crossovers as here are odd double crossovers at 50 map units or greater

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