Dichotomous keys Flashcards
(21 cards)
What is biological classification?
A hierarchical method used to organize living things based on their relationships
What are the two main types of biological classification?
- Artificial classification
- Phylogenetic classification
Define artificial classification.
Grouping organisms based on easily observable physical characteristics
What is phylogenetic classification based on?
The degree of similarity in their gene sequences
What is a dichotomous key?
A method for identifying living things using a series of contrasting statements about characteristics
List the steps involved in using a dichotomous key.
- Physically examining organisms
- Identifying differentiating characteristics
- Formulating differentiating questions or statements
- Repeating the process with remaining characteristics
Why was classification needed?
To organize approximately 9 million organisms on Earth
Who created the system of biological classification used worldwide?
Carl Linnaeus
What is binomial nomenclature?
A formal system for naming species with two parts: genus and species
What are the three domains in the taxonomic ranks?
- Bacteria
- Archaea
- Eukarya
What are the six kingdoms in the taxonomic system?
- Bacteria
- Archaea
- Protista
- Fungi
- Plantae
- Animalia
What is the phylum Chordata?
A phylum that includes all vertebrate animals
What is included in the class of mammals?
Animals characterized by features such as hair and mammary glands
What distinguishes members of the Order Coleoptera?
Hardened forewings
What is the family Felidae known for?
Including lions and tigers, characterized by retractable claws
What is a genus?
A group of species that share many features and have recent common ancestors
What is the most specific rank in the taxonomic hierarchy?
Species
Fill in the blank: The mnemonic for remembering taxonomic ranks is ‘Dear King Philip Came Over For _______’.
Good Spaghetti
How is the genus name formatted in binomial nomenclature?
Capitalized and italicized
How is the species name formatted in binomial nomenclature?
Begins in lower case and is italicized
Provide an example of a species name in binomial nomenclature.
- Panthera leo (lion)
- Homo sapiens (human)
