Natural selection

2. this increases if the mutation positively effects the survival of an organism
6. the islands Darwin visited to find evidence for his theory
9. a process which explains 'survival of the fittest'
12. this is the word that describes the changing of an organism over time, usually millions of years
13. a version of a gene

1. this can be change in the environment that puts stress on the survival of an organism
3. a word to describe differences in an organism
4. this word describes variation due to fertilisation
5. a change in sequence of DNA bases
7. this word describes a haploid cell produced as a result of meiosis
8. this is what organisms that survive do to have offspring
10. the surname of the man who came up with the theory of natural selection
11. this word describes a genetically identical cell