IB Bio 5.4 Cladistics

What are Cladistics?

• A system of classification that groups organisms together according to the characteristics that have evolved most recently

• A system of classification that groups organisms together according to the characteristics that have appeared most recently

• A system of classification that groups organisms together according to the characteristics that have evolved elsewise in relation to other species

• A system of classification that separates organisms from each other according to the characteristics that have evolved most recently

What are Cladistics

• A group of organisms that have evolved from a common ancestor

• The other answer seems quite right to me

• This is not the answer

What are primitive traits?

• Characteristics that have the same structure and function and evolved early on in the history of the organisms being studied

• Characteristics that have the same structure and function but have evolved more recently

What are Derived Traits?

• Characteristics that have the same structure and function but have evolved more recently

• Characteristics that have the same structure and function and evolved early on in the history of the organism being studied

What is Phylogeny?

• The study of the evolutionary past of a species

• The study of specific similar characteristics within two or more species

What is a Homologous trait?

• A trait/structure that is derived from the same part of a common ancestor

• Eyes are an example of a homologues trait trait

• Characteristics that may have the same function but not necessarily the same structure and they are not derived from a common ancestor

• Wings are an example of a homologous trait

Answer explanation

The wrong answers are examples of Analogous traits

Cladograms (right answer is node)

• Learn how to read one

• Node (Shows common ancestor)

• Outgroup (Shows those outside of the clade)

• Sister group (Shows descendants of a common ancestor)