17.2: Classification Based on Evolutionary Relationships

The evolutionary history for a group of species is called a

• clade

• phylogeny

• convergence

• taxonomy

The embryos of both mammals and reptiles are protected by amniotic fluid. What is this type of trait called?

• cladogram

• outgroup

• derived character

• molecular evidence

Cladistics is a classification system based on

• nomenclature

• dichotomous keys

• common ancestry

• physical characteristics

In a cladogram, what represents the most recent common ancestor shared by a clade?

• a mark by the clade's derived character

• the overlapping of one clade upon another

• the longest branch

• the node where branches meet

Which of the following would be considered the strongest evidence that two species are related to one another?

• common structures

• shared taxon

• similar genes

• same extinction pattern