Science 7

2. process in which paired chromosomes exchange portions of their DNA during meiosis
3. having one dominant and one recessive allele for a particular trait
5. some alleles are dominant and some are recessive
8. protein used to organize DNA
9. the formation of a new and distinct species in the course of evolution
11. a version of a gene that is present in a population
12. term used to refer to a cell that contains only a single set of genes
14. a specific characteristic of an individual
18. a package formed by eight histones
19. an allele that's trait is displayed phenotypically if an individual has at least one dominant allele
20. the fossils and the order in which they appear
22. scientific study of heredity
24. part of the earth between the core and the crust
25. an organized package of DNA
28. it will only be expressed if there is no dominant allele present, there needs to be two recessive genes to be expressed
29. sequence of DNA that codes for a protein
30. third layer of the physical model

1. second layer of the physical model
4. inner layer in the compositional model
6. change in the genetic material of a cell
7. physical characteristic of an organism
10. specialized cell division in which the number of chromosomes per cell are cut in half
11. an alteration in structure or function of an organism that is a result of natural selection
13. cell condition in which two of each type of chromosome are present
15. the process by which organisms that have adapted better to their environment tend to survive and produce more offspring
16. outer layer in the compositional model
17. having two identical alleles for a particular trait
21. first layer of the physical model
23. fifth layer of the physical model
26. fourth layer of the physical model
27. the genetic code in an organism