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Answer:
b). It has interference.
Interference refers to the reduction in the probability of occurrence of crossover at one location on a chromosome due to crossover occurring in another location. It means that the detection of the double recombinant classes shows that double crossovers must occur.
X---------10cM---------Y---------8cM----------Z
The distance between the genes = Recombination frequency (%)
The expected double crossover frequency = (Frequency between X & Y) * (Frequency between Y & Z
= 10/100 * 8/100 = 0.1 * 0.08 = 0.008 = 0.8%
0.8% out of 1500 = 12
Observed double crossovers = 5
Coefficient of Coincidence (COC) = Observed double crossovers / Expected double crossovers
= 5/12 = 0.42
Interference = 1-COC = 1-0.42 = 0.58
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