Natural selection

4. a group of organisms that normally interbreed in nature to produce fertile offspring
5. the formation of new species
6. the gradual development of different species from a common ancestor
8. ____________ isolation is the third step in speciation
9. ____________ characteristics enhance an organisms ability to survive and reproduce
10. a change in the structure of a gene resulting in a variant form that may be passed to the next generation
11. bacterial resistance to _________________ is an example of natural selection at work
13. adaptive ____________ is the result of divergent evolution
14. refers to the differences in genes and chromosomes that each individual inherits from their parents
16. the ___________ moth is an example of natural selection at work

1. ___________ selection refers to the prices by which humans breed animals or plants for particular traits
2. ___________ evolution refers to the evolution of new forms from a single ancestor
3. specific structures, functions and behaviours that increase an organisms chances of survival
6. natural selection is the process by which the ____________ 'selects' favourable characteristics, thereby reducing the frequency of unfavourable characteristics
7. a type of adaptation that involves the way an organism acts
12. ______________ evolution occurs when organisms evolve and develop similar adaptations due to living in similar environments and/or having similar lifestyles
15. an example of an animal species where there is little genetic variation and is therefore less likely to be able to respond to environmental change