What is mosaic evolution in zoology?

Which is the best definition for mosaic evolution ‘?

Mosaic evolution (or modular evolution) is the concept, mainly from palaeontology, that evolutionary change takes place in some body parts or systems without simultaneous changes in other parts. Another definition is the “evolution of characters at various rates both within and between species”.

What causes mosaic evolution?

Modules (groups of characters) change semi-independently of each other. They change at different times, so producing a mosaic of primitive and derived traits. These changes play a leading role in major evolutionary transitions.

What is the mosaic hypothesis?

The tripartite geographic mosaic hypothesis generates three ecological predictions: populations will differ in the traits shaped by an interaction; traits of interacting species will be well matched in some communities and mis- matched in others, producing some cases of local mala- daptation; and there will be few …

Is human evolution mosaic?

Recent new evidence shows that even our species may have evolved through a mosaic- like pattern, as shown by the anatomy of the early modern human-like forms found in Jebel- Irhoud, Morocco, which date to ca.

What is an example of mosaic evolution?

Mosaic evolution is the result of traits evolving at different rates or with different modes. For example, the diversification of locomotor behaviors in birds is thought to be related to the evolutionary independence of the forelimb and hind limb (3, 4, 8).

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What are the 4 trends of hominin mosaic evolution?

Four levels of transition are proposed—baseline, novel taxa, novel adaptive zones and major transitions—and the pattern of human evolution considered in the light of these.

What is mosaic evolution in hominins?

“Mosaic evolution” is also commonly used to refer to the sequential acquisition of evolutionary novelties within a single region or structure of the body—for example, in the hominin brain, canines, thorax, hand, pelvis, and foot.

Is genetic drift evolution?

Genetic drift is a mechanism of evolution. It refers to random fluctuations in the frequencies of alleles from generation to generation due to chance events. Genetic drift can cause traits to be dominant or disappear from a population. The effects of genetic drift are most pronounced in small populations.

What is a coevolutionary hotspot?

coevolution to evaluate how a pair of species coevolves when fitness. interactions are reciprocal in some locations (“hot spots”) but not. in others (“cold spots”).

Who developed the mosaic hypothesis?

He observed that in the normal development of Amphioxus, all three main types of symmetry, or cleavage patterns observed in embryos, could be found. Wilson proposed a hypothesis that reformed the Mosaic Theory associated with Wilhelm Roux in Germany.