Animalscaretips
- What is an example of a primitive trait?
- Which animals have forelimbs?
- What is a primitive organism?
- What is a primitive trait called?
- What are the major features of primates that are thought to be primitive traits?
- What consists of forelimb?
- Do penguins have forelimb?
- Do whales have forelimbs?
- Which organism is most primitive?
- What is the most primitive animal?
- What is the most primitive mammal?
- Are mammals monophyletic?
- What are monophyletic groups?
- What does a Polyphyletic group represent?
What is an example of a primitive trait?
Traits can be either primitive or derived. Primitive traits are those that a taxon has because it has inherited the trait from a distant ancestor. For example, all primates have body hair because we are mammals and all mammals share an ancestor hundreds of millions of years ago that had body hair.
Which animals have forelimbs?
Humans, whales, bats, eagles, lizards, frogs and chimpanzees are very different types of animals that use their forelimbs in very different ways. But beneath the skin, the forelimb bones of these animals are startlingly similar.
What is a primitive organism?
An organism which has a simple body structure and ancient body design or features that have not changed much over a period of time is called primitive. Advanced organisms were once primitive organisms and have been advanced with evolution over time.
What is a primitive trait called?
In phylogenetics, a primitive (or ancestral) character, trait, or feature of a lineage or taxon is one that is inherited from the common ancestor of a clade (or clade group) and has undergone little change since. ... Evolutionary relatedness between living species can be connected by descent from common ancestry.
What are the major features of primates that are thought to be primitive traits?
The anatomical and behavioral features that distinguish primates from members of other mammalian orders include a lack of strong specialization in structure; prehensile hands and feet, usually with opposable thumbs and great toes; flattened nails instead of claws on the digits; acute vision with some degree of ...
What consists of forelimb?
The forelimb consists of: Humerus, radius and ulna, carpals, metacarpals, digits or phalanges (see diagram 6.6). The top of the humerus moves against (articulates with) the scapula at the shoulder joint. By changing the number, size and shape of the various bones, fore limbs have evolved to fit different ways of life.
Do penguins have forelimb?
Some birds possess unique, derived features in the manus. Penguins, for example, have large, well-developed forelimbs ( Fig. 2A) for underwater "flying," although they have lost digit 1 and therefore have only two digits while retaining three metacarpals ( Fig.
Do whales have forelimbs?
The forelimb of cetaceans (whales, dolphins, and porpoises) has been radically modified during the limb-to-flipper transition. Extant cetaceans have a soft tissue flipper encasing the manus and acting as a hydrofoil to generate lift.
Which organism is most primitive?
Summary: A team of scientists announced that they have discovered AEG within cyanobacteria, which are believed to be some of the most primitive organisms on Earth.
What is the most primitive animal?
Cnidarians are the most primitive "true" multicellular animals (Subkingdom Eumetazoa). They are radially symmetric, and can be either sessile or motile, and sometimes both (at different stages in their life cycles). They are mostly marine, though hydrozoans are abundant in freshwater.
What is the most primitive mammal?
Monotremes, considered the most primitive form of mammals, have birdlike and reptilian features. The females lay eggs. Monotremes are represented by the aquatic duckbilled platypus and insectivorous echidna (spiny anteater).
Are mammals monophyletic?
Examples of monophyletic groups include: Mammals, birds, angiosperms, and insects. Examples of paraphyletic groups may include: fish, gymnosperms, protists, and invertebrates.
What are monophyletic groups?
A monophyletic group, sometimes called a clade, includes an ancestral taxon and all of its descendants. A monophyletic group can be separated from the root with a single cut, whereas a non-monophyletic group needs two or more cuts.
What does a Polyphyletic group represent?
A polyphyletic group or assemblage is a set of organisms, or other evolving elements, that have been grouped together based on characteristics that do not imply that they share a common ancestor that is not also the common ancestor of many other taxa (of course, if "life" is monophyletic, then any set of organisms ...
