Across
- 6. survival of the ________
- 8. combines with thymine
- 10. study of genes
- 11. determines who breeds
- 12. gene expression
- 13. the original dog
Down
- 1. DNA segments
- 2. ________somes
- 3. aka child
- 4. combines with guanine
- 5. makes up genes
- 7. _____mine
- 9. macromolecule acid