Across
- 5. a person who has the gene for a trait but is not affected (the recessive allele is masked by one that is normal)
- 6. pairs with cytosine in DNA
- 7. allele that is expressed when two different alleles are present
- 9. a single-stranded nucleic acid that is copied from one gene along the DNA is a recipe for a protein
- 13. these put together in specific patterns create proteins
- 14. allele that is expressed only when two copies of that same allele are present, can be hidden
- 16. change in an organism's DNA
- 17. complex molecule in a double helix shape that makes up chromosomes
- 19. pairs with adenine in DNA
- 20. a sequence of DNA that codes for a specific protein
- 21. Structure of DNA molecule
- 22. a recessive trait on the X chromosome is more likely to appear in people who are biologically ____
Down
- 1. Controls reaction rates, regulate cell processes, form bone and muscle, transport substances into cells, and help fight disease
- 2. a family tree to look at inherited traits
- 3. and Crick got the main credit for discovering the structure of DNA
- 4. long threadlike structure of DNA molecules that has the genes along it
- 6. the study of heredity and the variation of inherited characteristics
- 8. pairs with thymine in DNA
- 9. the process by which DNA is copied during the cell cycle
- 10. an alternative version of a gene
- 11. last name of woman who took the x-ray photo of the double helix
- 12. the cell organelle that acts as the chef to read the RNA instructions for a protein
- 15. pairs with guanine in DNA
- 18. a adenine and thymine together, or a guanine and cytosine together are called ____