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Human
Temporal range: Pleistocene
Image of a man and a woman on Pioneer plaque, sent into space with the Pioneer 11 mission
Secure
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Binomial name
Homo sapiens
Linnaeus, 1758
Trinomial name
Homo sapiens sapiens

Human evolution is ????

Evolution

In biology, evolution is change in the heritable traits of a population over successive generations, as determined by shifts in the allele frequencies of genes. Over time, this process can result in speciation, the development of new species from existing ones. All contemporary organisms on earth are related to each other through common descent, the products of cumulative evolutionary changes over billions of years. Evolution is thus the source of the vast diversity of life on Earth, including the many extinct species attested to in the fossil record.[1][2]

The modern understanding of evolution is based on the theory of natural selection, which was first set out in a joint 1858 paper by Charles Darwin and Alfred Russel Wallace and popularized in Darwin's 1859 book The Origin of Species. In the 1930s, Darwinian natural selection was combined with the theory of Mendelian heredity to form the modern evolutionary synthesis, also known as "Neo-Darwinism". The modern synthesis describes evolution as a change in the frequency of alleles within a population from one generation to the next. With its enormous explanatory and predictive power, this theory has become the central organizing principle of modern biology, relating directly to topics such as the origin of antibiotic resistance in bacteria, eusociality in insects, and the staggering biodiversity of Earth's ecosystem.

Natural selection is the process in which individual organisms with favorable traits are more likely to survive and reproduce than those with unfavorable traits. It works on the whole individual, but only the heritable component of a trait will be passed on to the offspring, with the result that favorable, heritable traits become more common in the next generation.Given enough time, this passive process can result in adaptations and speciation.

Opposing views

Primates

Australopithecus

Homo

Origin and migration

  1. Single origin theory - Out of Africa
  2. Multiple origin theory
  3. Combined theories

Culture

  1. Sociocultural evolution

Subsistence

  1. Food
  2. Hunting
  3. etc.

Tools

Fire

Adaptation

Symbolic thought

Language

Art

Religion

Agriculture

Civilization

  1. Urban




Hominin Species Distributed Through Time edit
Homo (genus)AustralopithecusArdipithecusParanthropusParanthropus robustusParanthropus boiseiParanthropus aethiopicusHomo sapiensHomo neanderthalensisHomo heidelbergensisHomo erectusHomo floresiensisHomo georgicusHomo habilisAustralopithecus garhiAustralopithecus africanusAustralopithecus bahrelghazaliAustralopithecus afarensisAustralopithecus anamensisOrrorin tugenensisSahelanthropus tchadensisPleistocenePlioceneMiocene

Comparative table of Homo species

species lived when (MYA) lived where adult length (m) adult weight (kg) brain volume (cm³) fossil record discovery / publication of name
H. habilis 2.5–1.5 Africa 1.0–1.5 30–55 600 many 1960/1964
H. rudolfensis 1.9 Kenya       1 skull 1972/1986
H. georgicus 1.8–1.6 Georgia     600 few 1999/2002
H. ergaster 1.9–1.25 E. and S. Africa 1.9   700–850 many 1975
H. erectus 2(1.25)–0.3 Africa, Eurasia (Java, China, Caucasus) 1.8 60 900–1100 many 1891/1892
H. cepranensis 0.8? Italy       1 skull cap 1994/2003
H. antecessor 0.8–0.35 Spain, England 1.75 90 1000 3 sites 1997
H. heidelbergensis 0.6–0.25 Europe, Africa, China 1.8 60 1100–1400 many 1908
H. neanderthalensis 0.23–0.03 Europe, W. Asia 1.6 55–70 (heavily built) 1200-1700 many (1829)/1864
H. rhodesiensis 0.3–0.12 Zambia     1300 very few 1921
H. sapiens 0.25–present worldwide 1.4–1.9 55–80 1000–1850 still living —/1758
H. sapiens idaltu 0.16 Ethiopia     1450 3 craniums 1997/2003
H. floresiensis 0.10–0.012 Indonesia 1.0 25 400 7 individuals 2003/2004

References

  1. ^ Futuyma, Douglas J. (2005). Evolution. Sunderland, Massachusetts: Sinauer Associates, Inc. ISBN 0-87893-187-2.
  2. ^ Gould, Stephen J. (2002). The Structure of Evolutionary Theory. Belknap Press. ISBN 0-674-00613-5.


See also

Category:Human evolution Category:Neogene

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