What is meant by the term mosaic evolution?

mosaic evolution, the occurrence, within a given population of organisms, of different rates of evolutionary change in various body structures and functions. An example can be seen in the patterns of development of the different elephant species.

Why is Mosaic Evolution important?

mosaic evolution Differential rates of development of various adaptive attributes that occur within the same evolutionary lineage. For example, a particular taxon might show greatly different rates of change with respect to the head, body, and limbs.

What do we mean when we say that some hominins have mosaic features?

The term Page 3 www.isita-org.com 47 A. Parravicini & T. Pievani “mosaic” refers here to the description of what we call “hominin morphological instability”, which means specific morphological assemblages or modules evolving independently from each other, in a non-harmonious way and at different rates when compared …

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 are mosaic features?

A mosaic is a pattern or image made of small regular or irregular pieces of colored stone, glass or ceramic, held in place by plaster/mortar, and covering a surface. Mosaics are often used as floor and wall decoration, and were particularly popular in the Ancient Roman world.

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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.

What causes neoteny?

Doug Jones, a visiting scholar in anthropology at Cornell University, said that human evolution’s trend toward neoteny may have been caused by sexual selection in human evolution for neotenous facial traits in women by men with the resulting neoteny in male faces being a “by-product” of sexual selection for neotenous …

What is the significance of hominid?

Hominids are the group of primates that includes humans, gorillas, and chimpanzees, among others. … The word hominid originally referred only to humans, and its Latin root reflects that: homo, or “man.” Today scientists use it to talk about any of the great apes (including humans).

What is robust about the so called robust early hominins?

The “robust” australopiths are a group of hominins with large cheek teeth and strongly built jaws that lived alongside the earliest members of our own genus, Homo, approximately 2.5-1.4 million years ago. Why they ultimately went extinct while we set off to conquer the world is still a mystery.

What are the trends in hominid evolution?

Hominin evolution is characterized by two main trends, transition to bipedality and increase in brain size. Fossil evidence shows that both trends had a major impact on the structure and function of the hominin skull.

What is the earliest dated hominid fossil?

Sahelanthropus was the earliest, dating 7-6 million years ago. Orrorin lived about 6 million years ago, while Ardipithecus remains have been dated to 5.8-4.4 million years ago.

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When were the Australopithecus found?

The earliest member of the genus Australopithecus is Au. anamensis, which was discovered in northern Kenya near Lake Turkana at Kanapoi and Allia Bay. The species was first described in 1995 after an analysis of isolated teeth, upper and lower jaws, fragments of a cranium, and a tibia unearthed at the discovery sites.

What is multi regional theory?

The multiregional hypothesis states that independent multiple origins (Model D) or shared multiregional evolution with continuous gene flow between continental populations (Model C) occurred in the million years since Homo erectus came out of Africa (the trellis theory).