Here are the answers to your worksheet questions.
18.2 Modern Evolutionary Classification
Evolutionary Classification
1.
Willi Hennig
*(Note: He is the scientist who introduced cladistics, which is the basis for modern evolutionary classification.)*
2.
evolutionary relationships (or
common ancestry)
*(Phylogenetic systematics groups organisms based on how closely related they are through evolution.)*
3.
the members of a clade corresponding to a genus
*(A genus is a smaller, more specific group than an order. Therefore, organisms in the same genus share a more recent common ancestor than those just in the same order.)*
For Questions 4 – 7:
4. All species descended from a(n)
ancestor (or
common ancestor) are part of a monophyletic group.
5.
Phylogeny is the study of how living and extinct organisms are related to one another.
6. A clade includes a common ancestor and all its descendants, living or
extinct.
Cladograms
For Questions 7 – 9:
7. A diagram that shows the evolutionary relationships among a group of organisms is called a(n)
cladogram.
8. The place where the ancestral lineage splits on a cladogram is called a fork, or a(n)
node.
9. Characteristics shared by members of a clade and only by members of that clade are called
derived characters.
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Final Answer:
1. Willi Hennig
2. evolutionary relationships
3. the members of a clade corresponding to a genus
4. ancestor
5. Phylogeny
6. extinct
7. cladogram
8. node
9. derived characters
Parent Tip: Review the logic above to help your child master the concept of section 18 2 modern evolutionary classification worksheet answers.
