mutation

1. A
2. B
3. C
4. D
5. E
6. F
7. G
8. H
9. I
10. J
11. K
12. L
13. M
14. N
15. O
16. P
17. Q
18. R
19. S
20. T
21. U
22. V
23. W
24. X
25. Y
26. Z
27. 123

Any change that is not normal in the genes in a cell. The change can result in a damaged gene, missing gene, or a gene that ends up in the wrong place. It may be caused by mistakes when a cell divides. It may be caused by something in the environment. It can be harmful, good, or have no effect. If this happens in a mother's egg or a father's sperm, it can be passed on to the parent's child. Some of these changes can lead to cancer or other diseases.

Audio contributed by: David Hyde Pierce