I got
1. C (mutations generate new alleles, whilst crossing over results in new allele combination. completely different).
2. B
3. B
4. A
5. C
6. C
7. A
8. B
9. C (not sure about this, could be B, discuss)
10. A
11. D
12. C
13. B
14. D
15. D
If you got these answers, then your guaranteed 15/15