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What characteristic is considered as Plesiomorphic?

What characteristic is considered as Plesiomorphic?

oxford. views 1,520,656 updated. plesiomorphy (ancestral trait) An evolutionary trait that is homologous within a particular group of organisms but is not unique to members of that group (compare apomorphy) and therefore cannot be used as a diagnostic or defining character for the group.

What is the difference between Plesiomorphy and Symplesiomorphy?

In phylogenetics, a plesiomorphy (“near form”) is an ancestral character state. A symplesiomorphy ( from syn- “together”) is a plesiomorphy shared by two or more taxa (including taxa earlier in the clade). Pseudoplesiomorphy is any trait that can neither be identified as a plesiomorphy nor as an apomorphy.

What is a plesiomorphy example?

For example, primates form a more recently evolved mammalian group. Therefore, hair is a plesiomorphy (ancestral character) for primates. Because hair, as an ancestral mammalian character, is shared by all primates, it is also a symplesiomorphy (shared plesiomorphy) for primates in general.

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. Identify all of the synapomorphies shown in the cladogram.

What is an example of ancestral trait?

Because an ancestral trait may occur across many species—for example, opposable thumbs in marmosets, ring-tailed lemurs, and gorillas—it cannot be used to further elucidate their genetic relationships. …

What is the difference between plesiomorphy and apomorphy?

Apomorphy: The absence of legs is an example of an apomorphic character in snakes. Plesiomorphy: The presence of legs is an example of a plesiomorphic character in reptiles. Apomorphy and plesiomorphy are two terms used to describe similar characters or traits within a clade.

Is the Yellow Mask a plesiomorphy or an apomorphy?

The yellow mask is a plesiomorphy for each living masked species, because it is ancestral. It is also a symplesiomorphy for them. But for the four living species as a whole, it is an apomorphy because it is not ancestral for all of them. The yellow tail is a plesiomorphy and symplesiomorphy for all living species.

What is the difference between an apomorphy and a synapomorph?

Synapomorphy and apomorphy. 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. In other words, it is an apomorphy shared by members of a monophyletic group,…

How is apomorphy used to define a clade?

Apomorphy is an evolutionary characteristic or a trait, which is unique to a particular clade. This characteristic is present in all the descendants of that particular clade. Hence, we can use the apomorphic characteristic of a clade or a taxon to define a particular clade or a taxon.