A test cross of F1 files + a/+b produces the following number of offsprings:
| ++/ab | 9 |
| ab/ab | 9 |
| +b/ab | 41 |
| a+/ab | 41 |
| | |
What will be the distance between two genes?
(a) 82 cM (cis)
(b) 18 cM (cis)
(c) 18 cM (trans)
(d) 20 cM (cis)
