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Key Area 3.6
Revision for Key area 3.6 Evolution of species
| Question | Answer |
|---|---|
| Define mutation | A random change to genetic material |
| Mutations can be either... | Advantageous, Disadvantageous or Neutral |
| Name 2 examples of environmental factors which can increase the rate of mutations | Radiation (e.g UV, X-rays, gamma rays) and Chemical (e.g bromine) |
| Give one example of an adaptation to a warm environment | Large surface area, storage of fat (camels), spines for less stomata (cacti) |
| Give examples of selection pressures | Lack of food, predation or competition |
| Give an example of natural selection | Peppered moth |
| Define speciation | The formation of two or more species from the original one. |
| State all four stages of speciation | 1. Isolation 2. Mutation 3. Natural selection 4. Speciation |
| Name all three forms of isolation barrier | Ecological, behavioural, geographical |
| Give an example of a geographical isolation barrier | Mountains, rivers, oceans etc |
| Give an example of a ecological isolation barrier | pH, temperature etc |
| Give an example of a behavioural isolation barrier | different mating seasons, physical incompatibility etc |
| What is meant when an organism is described as having a 'selective advantage'? | The organism has characteristics that help it to survive and reproduce in its environment |
| During speciation when do two groups of organisms become separate species? | When they cannot interbreed to produce fertile offspring |
Created by:
MissBryce
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