Classification B2
This is a mindmap on classification to help with revision if your are doing the modular exams B2 ,C2 ,and P2.It includes the problems of classifying ,grouping organisms and evolution.
- Created by: Sabah
- Created on: 24-12-12 14:40
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- Classification
- Grouping organisms
- Keep ,Plates ,Clean, Or ,Family, Gets ,Sick
- Kingdom, Phylum ,Class ,Order, Family ,Genus ,Species
- As you move down towards 'species' there are fewer organisms within each group and they share more similarities
- Organisms can be classified in two ways:
- An artificial system is based on one or two charecterisitics that makes identification easier.
- E.G . Birds that live by or on the sea can be called sea birds,
- A natural system is based on evolutionary relationships and is much more detailed.
- Animals that are more closely related are more likely to be in the same group.
- An artificial system is based on one or two charecterisitics that makes identification easier.
- Sequencing the bases in DNA has enabled scientists to know how closely related organisms are ,and has often meant that organisms can be reclassified.
- Keep ,Plates ,Clean, Or ,Family, Gets ,Sick
- Species
- A species is a group of organisms that can interbreed to produce fertile offspring.
- All organisms are named by the binomial system .The system works like this:
- There are two parts to the name 1.Genus 2.Species
- Genus:Capital letter and Species:lowercase letter
- Problems with classifying
- E.G. Archaeopteryx ,this creature has charecterisitics that would put it in two diffrent groups.
- It had feathers like a bird. It also had teeth and a long bony tale like a reptille.
- Some organisms present specific problems:
- Bacteria do not interbreed , they reproduce asexually ,so they cannot be classified into species using the fertile offspring idea.
- Hybrids are infertile ,so mules cannot be classed as a speices
- E.G. Archaeopteryx ,this creature has charecterisitics that would put it in two diffrent groups.
- Classification and Evolution
- When classifying organisms, it is important to b bear in mind that similarities and differences between organisms may have different explanations:
- Dolphines and fish live in the same habitat (ecologically related). However because dolphins are mammals they are classified diffrently.
- Dolphins and bats have evolved to live in diffrent habitats , but both are mammals they are related through evolution
- When classifying organisms, it is important to b bear in mind that similarities and differences between organisms may have different explanations:
- Grouping organisms
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