The opposable thumb of primates (lemurs, monkeys, apes (including humans)) is a / an ___ of all primates.*Opposable thumb is a thumb (first digit / finger of the hand) that can be placed opposite the fingers of the same hand.

Question

BlackTom AI · Accepted Answer

The question asks about the opposable thumb of primates and provides several term options to classify this trait.
Option a: a. synapomorphy. This term refers to a shared derived character that is unique to a particular clade; the opposable thumb is indeed a defining derived trait that groups all primates together, distinguishing them from other mammals. Hence, this option correctly labels the trait as a synapomorphy.
Option b: b. symplesiomorphy. A symplesiomorphy is a shared ancestral character, not a derived one. The opposable thumb is not an ancestral trait for all mammals but rather a derived feature that characterizes primates, so this choice misclassifies the trait.
Option c: c. taxonomically. This word describes a relation to taxonomy or the science of classification, not a type of character state or evolutionary novelty. As such, it does not appropriately name the trait in question.
Option d: d. ancestrally. This term would imply an ancestral origin, similar to symplesiomorphy, but it is not the standard label for a specific evolutionary trait. It does not capture the idea of a derived, clade-defining feature.
Option e: e. cladistically. This is an adverb describing methodology or approach (cladistics) rather than a specific type of character state. It does not name the nature of the opposable thumb trait itself.
In summary, the opposable thumb fits the concept of a synapomorphy because it is a derived shared feature that defines the primate lineage, whereas the other terms either describe ancestry inappropriately, refer to methodological approaches, or describe broader categories rather than the specific character state.

The opposable thumb of primates (lemurs, monkeys, apes (including humans)) is a / an ___ of all primates.*Opposable thumb is a thumb (first digit / finger of the hand) that can be placed opposite the fingers of the same hand.单项选择题

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