Across
- 3. the fusion of sperm and an egg
- 4. change in a gene
- 10. only present when both parents have it
- 13. a "mutt"; different alleles
- 14. a duplicate copy of dna
- 15. a feature of a living organism
- 17. a parent that passes down a disorder
- 19. a specific gene
- 20. the chances of offspring inheriting a trait
- 21. the next generation of a species
Down
- 1. always appears when present in genes
- 2. a purebred; two matching alleles
- 5. physical expression
- 6. a trait passed down from a parent
- 7. a basic form of heredity made of dna
- 8. genetic expression
- 9. how traits are passed down to offspring
- 11. reproduction with one parent
- 12. most important part of a cell
- 16. fusion of male sperm and a female egg
- 18. the most basic unit of life