Biology Review Crossword

2. The change in the characteristics of a species over several generations, often through natural selection.
3. The study of inheritance.
4. An allele that will be expressed if present in a heterozygous individual.
7. The sequence of events that a cell goes through as it grows and divides.
8. A type of cell division that results in four daughter cells with half the number of chromosomes as the parent cell.
12. The movement of molecules across a cell membrane without energy input.
13. The outer boundary of a cell, controlling what enters and exits.
15. The passing of genetic material from parent to offspring.
18. A variant form of a gene.
20. A type of cell division that results in two daughter cells with the same number of chromosomes as the parent cell.
21. The total mass of organisms in a given area or volume.
24. The maintenance of a stable internal environment.
25. The maintenance of a stable internal environment.
26. Interactions between different species, including mutualism, commensalism, and parasitism.
28. All the populations of different species living in the same area.

1. An allele that will only be expressed if two copies are present in an individual.
5. The study of genes, heredity, and variation.
6. The process by which cells convert nutrients into energy.
9. The fundamental units of all living organisms.
10. The molecule that carries the genetic information.
11. The control center of the cell, containing DNA.
14. Single-celled microorganisms.
16. Organelles in plant cells where photosynthesis occurs.
17. Large-scale ecological communities.
19. A community of organisms and their abiotic environment.
22. A change in the DNA sequence.
23. The chemical reactions that occur in living organisms.
27. The study of how living organisms interact with each other and their environment.