evolution and natural selections

5. when germs and fungi develop a resistance to the drug used to kill them
7. something a animal does usually in response to some sort of external stimulus in order to survive
10. any cell or organism that processes a clearly defined nucleus
12. any heritable trait that helps an organsism
13. on parent copies it self to form a genetically identical offspring
14. the change in frequency of an existing gene variant in the population so to random chance
15. any organism that lacks a nucleus or other organelles
17. the dying out of extermination of a species
19. when populations of living organisms adapt and change
20. a branch of science that is related to the formation, growth, and development of an embryo

1. choosing parents with particular characteristics to breed together and produce offspring
2. different organisms independently evolve similar traits
3. an organism combines the genetic information from each of the parents and are unique
4. the process which interbreeding species diverge two or more evolutionary groups
6. an infectious segment of nucleic acid surrounded by a protein
8. type of structural modification made to part of a body
9. a term that describes mechanisms of gene transfer from one population to another
11. one of two or more alternative forms of genes that arise from a mutation and are found on the same place of a chromosome
16. when a group within a species separates from other members of the species and develops its own characteristics
18. a small single celled organism