Across
- 3. Level The position an organism occupies in a food chain.
- 8. The non-living parts of an ecosystem, such as sunlight and water.
- 10. A close and long-term interaction between two different biological species.
- 12. Having two different alleles for a particular gene.
- 15. The physical appearance or observable traits of an organism.
- 18. The control center of a eukaryotic cell that contains genetic material.
- 21. A thread-like structure of nucleic acids and protein carrying genetic information.
- 23. A specialized subunit within a cell that has a specific function.
- 24. The primary energy carrier molecule used by cells.
- 28. A community of living organisms interacting with their non-living environment.
- 29. The process where organisms better adapted to their environment survive and reproduce.
- 31. The molecule that carries the genetic instructions for life.
- 32. The phenotype or genotype that is most common in a natural population.
- 34. An allele that masks the expression of a recessive allele.
- 35. The specific role or position an organism has within its habitat.
- 36. A protein that acts as a biological catalyst to speed up chemical reactions.
- 37. An organism that breaks down dead organic matter.
- 38. The change in the heritable characteristics of populations over generations.
- 39. The jelly-like substance that fills the cell and surrounds the organelles.
Down
- 1. A structure that has lost its original function through evolution.
- 2. The site of protein synthesis in the cell.
- 4. Having two identical alleles for a particular gene.
- 5. The science of naming, defining, and classifying groups of organisms.
- 6. An organism that must eat other organisms for energy.
- 7. The evolutionary history and relationship of a group of organisms.
- 9. The living components of an ecosystem.
- 11. The basic structural and functional unit of all living organisms.
- 12. Physical features shared by different species because of a common ancestor.
- 13. The tendency of a system to maintain a stable internal environment.
- 14. The genetic makeup of an organism, represented by letters.
- 16. An organism that produces its own food, usually through photosynthesis.
- 17. A trait that helps an organism survive and reproduce in its environment.
- 19. The organelle in plant cells where photosynthesis occurs.
- 20. The formation of new and distinct species in the course of evolution.
- 22. An allele that is only expressed when two copies are present.
- 25. Membrane: The semi-permeable boundary that regulates what enters and leaves the cell.
- 26. One of two or more alternative forms of a gene.
- 27. A specific segment of DNA that codes for a particular protein or trait.
- 30. The two-part naming system for species consisting of Genus and species.
- 33. The organelle responsible for producing energy (ATP) through cellular respiration.