Question | Answer |
What is Natural Selection | The survival of the organisms best ADAPTED to their surroundings. Best adapted survive and reproduce. |
What is a SPECIES | A group of organisms that look similar and can reproduce resulting in FERTILE offspring |
Name 3 Isolating Mechanisms | Geographical & Ecological & Behavioural Isolation |
Give an example of Behavioural Isolation | Different breeding seasons OR Different Courtship behaviour, different mating song |
Give an example of Geographic Isolation | Rivers OR Seas OR Mountains OR Deserts separating sub-populations |
Give an example of Ecological Isolation | Sub-populations live in different habitats within an ecosystem and don’t mix OR one sub-population is tolerant to an Abiotic factor the other sub-population can’t tolerate and so they do not mix |
What is a Niche | The role an organism plays within an Ecosystem |
What process has led to Antibiotic resistance due to over prescription | Natural Selection |
What caused the Melanic form of the Peppered Moth to appear | Mutation |
What process makes it unlikely for the Melanic Peppered Moth to be found in the country side | Natural Selection |
What characteristic of Bacteria behaviour results in a high mutation rate | High reproduction rate |
What are the stages in speciation? | Isolation-->Sub populations-->mutations in each sub-pop-->natural selection in each sub-pop-->different selective pressurs in each sub-pop--> reintroduce each sub-pop and infertile offspring =speciation |
What is the only sourde of new alleles? | Mutations |
What environmental factors cause mutations | Radiation and some Chemicals |