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.

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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.

BIO 181 (001&002) FALL 2025 FA25: Exam 3: Phylogeny & Biodiversity (Breathe in, breath out)

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.

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BIO 181 (001&002) FALL 2025 FA25: Exam 3: Phylogeny & Biodiversity (Breathe in, breath out)

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.

查看解析

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类似问题

Please use this image to answer the following questions. 1: The sister taxa to humans. ____ 2: The lizard is most closely related to ____. ____ 3: The outgroup ____

Hair on humans and other hominids is _____ .

Use the phylogenetic tree below to answer the following: True or False? Plants are more closely related to protists than they are to fungi.

Use a specific one-word answer to receive credit.Ideally, when making phylogenetic trees, the taxa in the tree should be ___ .Please double check your spelling to make sure the word is spelled correctly. Thank you!

Gorillas’ bodies have hair, and their closest living relatives also have hair on their bodies. What type of characteristic is this?

Which part of the phylogenetic tree is the red arrow pointing to? Click Here if you are unable to see the image (opens in new window)

There is more than one correct way to show relationships using a phylogenetic tree. Three of the four trees displayed below show the same relationship between species A, B, C, D, and E. Which tree shows a different relationship?Tree 1 Tree 2 Tree 3 Tree 4

The law of parsimony suggests that traits that…are the best ones for phylogenetic trees.

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风格化写作助手

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