Understanding Cladograms and Phylogenetic Trees

What is the primary purpose of a cladogram?

• To illustrate the physical characteristics of species

• To group organisms based on their relatedness

• To show the geographical distribution of species

• To depict the evolutionary timeline of species

Which of the following is NOT a type of grouping in cladograms?

• Monophyletic

• Paraphyletic

• Polyphyletic

• Heterophyletic

What defines a monophyletic group?

• Geographical proximity

• Convergent traits

• Multiple evolutionary origins

• Shared derived characteristics

What is a synapomorphy?

• A trait that evolved multiple times

• A shared derived characteristic

• A trait unique to a single taxon

• A trait that is not inherited from a common ancestor

How many cuts are needed to form a paraphyletic group?

• Two

• One

• Four

• Three

Why are dinosaurs considered a paraphyletic group?

• They exclude the descendants that are birds

• They include all descendants including birds

• They have multiple evolutionary origins

• They are defined by convergent traits

What is a limitation of cladograms?

• They cannot depict temporal relationships

• They cannot show morphological traits

• They cannot be used in paleontology

• They cannot group organisms

What characterizes a polyphyletic group?

• A single evolutionary origin

• Geographical proximity

• Multiple evolutionary origins

• Shared derived characteristics

Which of the following is an example of a polyphyletic grouping?

• Reptiles

• Mammals

• Birds

• Pachyderms

What is a common trait among animals in the polyphyletic group 'pachyderm'?

• Fins

• Feathers

• Thick, rough skin

• Wings