Across
- 4. occurs when two or more atoms are joined by chemical bonds.
- 5. is the formation of eggs and sperm.
- 6. semiconductors of electric energy.
- 7. is the measure of how much mass something has for its size.
- 8. is the scientific study of genes and heredity.
Down
- 1. is defined as all the observable characteristics of an organism.
- 2. is the average of all different types of isotopes of that element.
- 3. involves the sharing of electrons between two atoms.
- 6. are changes in the alleles that introduce new genetic information into a group.
- 7. abbreviation of deoxyribonucleic acid.