A3.2 Classification and Cladistics HL

What is the main focus of classification in modern biology?

• Physical characteristics

• Evolutionary relationships

• Geographical location

• Behavioral traits

Which of the following is NOT a traditional taxonomic level?

• Domain

• Kingdom

• Species

• Clade

What is a clade?

• A group of organisms that live in the same habitat

• A group of organisms with the same behavior

• A group of organisms that share a common ancestor

• A group of organisms with similar physical traits

What is the principle of parsimony?

• The answer with the least evidence is correct

• The answer with the most evidence is correct

• The most complex answer is usually correct

• The simplest answer is usually correct

What is a cladogram used for?

• To show physical characteristics of organisms

• To show evolutionary relationships

• To show geographical distribution

• To show behavioral patterns

What is the boundary paradox?

• Difficulty in determining when two species diverged

• Difficulty in identifying physical traits

• Difficulty in finding common ancestors

• Difficulty in classifying organisms based on behavior

What is the root in a cladogram?

• The most recent common ancestor

• The first species in the clade

• The origin of all clades in the diagram

• The last species in the clade

What is the significance of molecular evidence in classification?

• It helps in studying behavioral patterns

• It helps in determining geographical distribution

• It helps in understanding evolutionary relationships

• It helps in identifying physical traits

What is BLAST used for?

• To compare gene sequences

• To compare behavioral traits

• To compare physical traits

• To compare geographical locations

What was discovered about the figwort family through gene sequencing?

• They all shared a common ancestor

• They did not have a common ancestor

• They lived in the same habitat

• They had the same physical traits