A)no double crossovers occur among nearby genes.
B)the number of observed double crossovers is greater than the number of expected double crossovers.
C)the number of observed double crossovers is less than the number of expected double crossovers.
D)the occurrence of one crossover interferes with the formation of another crossover nearby.
E)Both C and D

A)1%.
B)5%.
C)10%.
D)50%.
E)100%.

A)(3)² = 9
B)(2)³ = 8
C)(3)³ = 27
D)(2)² = 4
E)It cannot be predicted.