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ClickBiology
Cambridge IGCSE Biology
Classification and Keys
ClickBiology
ClickBiology
You will need to be able to:
• Define and describe the binomial system of naming species
• Use a dichotomous key to identify an unknown organism
ClickBiology
Biological classification:
Kingdom
Phylum
Class
Order
Family
Genus
Species
Animalia
Chordata
Mammalia
Carnivore
Felidae
Panthera
pardus
Taxonomic ranks
Panthera pardus
ClickBiology
The binomial system gives organisms a two word name showing the genus and species
Panthera leo Panthera tigris Panthera pardus
Genus species GenusGenus speciesspecies
ClickBiology
There are other classification systems:
• Cladistics:Based on similarity and differences between DNA and RNA sequences
Extended
AAAA
AACA
AGAA AGTA
AGGA
ClickBiology
You will need to be able to:
• Define and describe the binomial system of naming species
• Use a dichotomous key to identify an unknown organism
ClickBiology
Keys use a series of questions to identify unknown organisms
1. Stalk does not have a frill go to 2Stalk has a frill go to 3
2. Stem is brown Fungus AStem is yellow Fungus B
3. Cap has spots go to 4Cap does not have spots Fungus C
4. Cap is red Fungus DCap is brown Fungus E
frill
capIdentify the fungus
ClickBiology
Now you should be able to
• Define and describe the binomial system of naming species
• Use a dichotomous key to identify an unknown organism
ClickBiology
Cambridge IGCSE Biology
www.ClickBiology.com