Evolutionary Relationships Answers

Which of the following are Phylogenetic trees also know as ?

Consider the phylogenetic tree of Old World primates.According to the tree, which primates share the most recent common ancestor with humans?

Which describes the modern classification system?

A scientist discovers a new organism that is related to clownfish. What can the scientist discover by using molecular clocks?

Dr. Digger, a paleontologist, finds a fossil that he describes in his journal.The creature was approximately 1 meter long, with its backbone fused into a large shell covering the body cavity. It had a beaklike mouth, without teeth, and all four limbs were in the form of flippers.Based on anatomical similarities, to which modern animal is Dr. Digger’s creature most closely related?

Why was modern classification invented?

Consider the cladogram.According to the cladogram, which organisms have roundworms as a common ancestor?

Protists are a group of organisms that are characterized as eukaryotes (they have cells with nuclei) that are neither plants nor animals nor fungi. They are very diverse, and there are many hypotheses about their classification. The cladogram for protists is constantly changing and, sometimes, there are opposite hypotheses that both have data to support them. What is the implication of a changing hypothesis?

Consider the cladogram.Which group of organisms has the derived characteristics of true tissues, bilateral symmetry, and a pseudocoelom?

Julia is trying to place a duckbilled platypus, lizard, bear, and monkey on a phylogenetic tree. She learns that the duckbilled platypus, bear, and monkey are classified as mammals. She also learns that mammals share a common ancestor with reptiles. Which additional piece of information will be most helpful to Julia to properly build her phylogenetic tree?