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WorksheetsModern Classification
Total questions: 20
Worksheet time: 10mins
The most important difference between classification during the time of Linnaeus and current classification is that organisms are now grouped according to their
fossil relationships.
size relationships.
ecological relationships.
evolutionary relationships.
A diagram that shows evolutionary relationships among species is called a
cladogram
derived characters
monophyletic
phylogeny
Lions and ocelots have retractable claws, but foxes do not. We can conclude that
lions and foxes are more closely related than lions and ocelots.
lions and ocelots are more closely related than lions and foxes.
the unretractable fox claw is a derived characteristic.
foxes are completely unrelated to lions or ocelots.
A clade contains
all organisms with similar appearances.
organisms living within the same ecosystem.
an ancestral species and all the organisms that came before it.
an ancestral species and all its descendants.
If two species have similar DNA sequences but different observable characteristics,
they are not closely related.
scientists need to re-examine the DNA evidence.
the species are more closely related than their appearances imply.
they could not have shared a recent common ancestor.
A single common ancestor and all of its descendants is considered a...
phylogenetic group
monophyletic group
taxon
clade
A group of species of species that includes a single common ancestor and all of descendants
clade
taxa
monophyletic group
phylogenetic group
The splitting point on a cladogram is considered a...
clade
derived character
root
node
A trait that arose in the most recent common ancestor of a group and was passed on to its descendants
clade
cladogram
derived characters
node
Why must scientific be carful about using the absence of traits?
Distantly related groups can sometimes lose the same trait
It doesn't give accurate DNA analysis
Distantly related groups can sometimes gain the same trait
Losing a trait tells use nothing about an organism
The goal of modern classification is to....
understand the relationships among certain living organisms
understand the relationships among all living things on Earth
understand the similarities and differences of organisms
understanding the similarities of biogeographical habitats
Homologous genes in two organisms can tell use...
the similarities and differences in appearance
how closely related organisms are to each other
what genes mutated
the genetic make up of the organism
A specific trait that is used to construct a cladogram is called a...
derived character
clade
structural feature
taxon
A branch of a cladogram that consists of a single common ancestor and all of its descendants is called
cladistics
a clade
a kingdom
a class
Which groups share derived character 1
A and B
A and C
B and C
A, B and C
Which descendant doesn't share any derived characters?
A
B
C
None they all share 1 derived character
Which of the following groups shares the most recent common ancestor?
Mosses and ferns
cone-bearing plants and ferns
cone-bearing plants and flowering plants
Mosses and flowering plants
Which derived character appeared first during the course of the plants' evolution
embryo
vascular tissue
seeds
flowers
Which derived character most recently appeared during the plants' evolution?
seeds
flowers
vascular tissue
embryo
If species A and B have very similar genes, which of the following statements is probably true?
Species A and B shared a relatively recent common ancestor
Species A evolved independently of species B for a long period
Species B is older than species A
Species A is older than species B
