The genes a and b are on the same chromosome in Neurospora. Across between ab x ++ was made and the following ordered tetrad data were obtained from this cross.
a b a b ab ab a b
a b ++ +b ++ +b
+ + ab a+ ++ ++
+ + ++ ++ ab a+
129 21 104 15 31 Total=300
Determine the following map distances-
(a) a-centromere . (b) b- centromere . (c) a-b