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2021-05-14

Which two organisms on the Cladogram are the most closely related Why are they the most closely related?

Which two organisms on the Cladogram are the most closely related Why are they the most closely related?

Why? Worms and spiders are more closely related. They have more traits in common.

Which pair of organisms are the most closely related?

Which pair of organisms are most closely related? Organisms 2 and 3 are most closely related because they have the same family name.

How can I tell which organisms are more closely related on a Cladogram?

To determine how closely related two organisms on a cladogram are, TRACE from the first one to the second one. The more nodes you pass, the farther apart the organisms are in terms of evolutionary relationship.

Which organism on your Cladogram is the most recently evolved?

Chordata

What are the dots on the Cladogram a representation of?

What does each node on a cladogram represent? The last point at which the new lineages shared a common ancestor. the common ancestor shared by all organisms on the cladogram. In general, the more derived characters two species share, the more recently they shared a common ancestor and the more closely they are related.

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What does a Cladogram show?

A cladogram (from Greek clados “branch” and gramma “character”) is a diagram used in cladistics to show relations among organisms. A cladogram uses lines that branch off in different directions ending at a clade, a group of organisms with a last common ancestor.

What is the function of a Cladogram?

A cladogram is an evolutionary tree that diagrams the ancestral relationships among organisms. In the past, cladograms were drawn based on similarities in phenotypes or physical traits among organisms. Today, similarities in DNA sequences among organisms can also be used to draw cladograms.

What does Cladistic mean?

: a system of biological taxonomy that defines taxa uniquely by shared characteristics not found in ancestral groups and uses inferred evolutionary relationships to arrange taxa in a branching hierarchy such that all members of a given taxon have the same ancestors.

How do you tell if a trait is derived or ancestral?

Ancestral traits are shared throughout the larger group. Derived traits are present only in a smaller group. The smaller group is defined and identified by having the derived trait. The derived trait is a feature which was present in the ancestor of the members of the smaller group.

What is a shared primitive trait?

A shared, primitive character (such as the post-anal tail of all vertebrates) is called a symplesiomorphy. Symplesiomorphies can tell us that animals share a common ancestor that also shared that trait. But to separate animals into less inclusive, related groups we must consider more recently evolved traits.

What does Synapomorphy mean?

: a character or trait that is shared by two or more taxonomic groups and is derived through evolution from a common ancestral form.

What is an Apomorphic trait?

: a specialized trait or character that is unique to a group or species : a character state (such as the presence of feathers) not present in an ancestral form In this case, white flowers are a derived condition, an apomorphy, and red flowers are the ancestral condition.—

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Is hair a Synapomorphy?

Synapomorphy. Within this taxon set, hair is a shared derived character (synapomorphy) of therian mammals, and indicates a close relationship of marsupial (metatherian) and placental (eutherian) mammals.

What is the difference between Synapomorphy and Symplesiomorphy?

Synapomorphy refers to a characteristic present in an ancestral species and shared exclusively (in more or less modified form) by its evolutionary descendants while symplesiomorphy refers to an ancestral character (trait-state) shared by two or more taxa.

Why is every Synapomorphy a Symplesiomorphy?

An same as autapomorphy is a derived trait that is unique to one group, while a same as synapomorphy is a derived trait shared by two or more groups. A same as symplesiomorphy is similarly a shared primitive trait. This means that a trait can be a synapomorphy and a symplesiomorphy if different nodes are considered.

Can a character be both an Apomorphy and Plesiomorphy?

Can a character be both an apomorphy and a plesiomorphy? Explain your answer. YES, IT DEPENDS ON THE TAXON OR GROUP OF TAXA BEING REFERRED TO. 5.

Why do Synapomorphies arise during evolution?

Why do synapomorphies arise during evolution? When a new species begins evolving independently, novel traits arise which are then passed on to its descendant species. Fewer changes have to occur to make the origin of traits fit on the tree.

What is the difference between Apomorphy and Synapomorphy?

An apomorphy is a character that is different from the form found in an ancestor, i.e., an innovation, that sets the clade apart from other clades. A synapomorphy is a shared apomorphy that distinguishes a clade from other organisms.

Why is an outgroup important?

The outgroup is used as a point of comparison for the ingroup and specifically allows for the phylogeny to be rooted. Because the polarity (direction) of character change can be determined only on a rooted phylogeny, the choice of outgroup is essential for understanding the evolution of traits along a phylogeny.

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What does it mean for a group of organisms to be paraphyletic?

Paraphyletic taxon : A group composed of a collection of organisms, including the most recent common ancestor of all those organisms. Unlike a monophyletic group, a paraphyletic taxon does not include all the descendants of the most recent common ancestor.

What characteristics were used to classify organisms?

Three of the major characteristics used to classify organisms are cell structure, mode of nutrition and cellularity. These characteristics help scientists determine how organisms are similar to each other as well as how they are different from each other.

Why is fish a paraphyletic group?

In the traditional taxonomy of vertebrates, where fish are a separate class from the classes of terrestrial vertebrates, the class of fish is paraphyletic, since the terrestrial vertebrates are descended from a type of fish. Compare monophyletic polyphyletic.

What is the meaning of Polyphyletic?

: of, relating to, or derived from more than one ancestral stock specifically : relating to or being a taxonomic group that includes members (such as genera or species) from different ancestral lineages.

What is the difference between mono Para and Polyphyletic groups?

Paraphyletic group is a taxon that consists of a most recent common ancestor and some of its descendants. Polyphyletic group is a taxon that consists of unrelated organisms who are from a different recent common ancestor. This group lacks a most recent common ancestor.

What is Polyphyletic evolution?

Polyphyletic groups are formed when two lineages convergently evolve similar character states. Polyphyletic groups are recognized by pheneticists but not by cladists or evolutionary classifiers. An example of a polyphyletic group is bats and birds: both have wings, but they have evolved separately.

When a shared character state is present but not inherited from a common ancestor?

A character state is homoplastic or “an instance of homoplasy” if it is shared by two or more organisms but is absent from their common ancestor or from a later ancestor in the lineage leading to one of the organisms. It is therefore inferred to have evolved by convergence or reversal.