Across
- 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
Down
- 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