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Title: Evolution of human
Description: In this notes you get a brief knowledge about human evolution throught out the time till now and their name.
Description: In this notes you get a brief knowledge about human evolution throught out the time till now and their name.
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Introduction
Homo sapiens, the most prominent species on earth is the result of over
7 million years of evolution
...
Man belongs to the family Hominidae of the order Primates
...
With the passage of time, their
ancestors evolved and became more and more different
...
Earliest Ancestor
modern humans are a relatively new species on the planet
oldest Homo sapiens fossil are ~200,000 yrs old
about 100 B people have lived on earth so far or about 100,000
generations
today we can trace human history using the males’
“Y-chromosome” and mitochondrial DNA
the Y chromosome is passed to the males of every generation
DNA in the mitochondria and passed the males & females of every
generation
results of mitochondrial genetic studies indicate that all living humans are
related to a single
woman (“Eve”) who lived ~150,000 years ago in east Africa
results of Y-chromosomal inheritance studies
indicate that all living humans are related to a single man (“Adam”) who
lived sometime
between 120,000 to 156,000 years ago
however, some Cameroonians and one African American
tested have Y chromosomes not related to the above
male ancestor; their Y-chromosome date to between
180,000 to 581,000 years ago
the human genome is 99
...
4 million years old
...
In fact, instead of the human evolution
tree, a more accurate analogy could be drawn to an evolutionary bush
...
Furthermore, the concept of a “missing link” between apes and humans
was considered preposterous by scientists because we have evolved
alongside the great apes
...
Furthermore, evolution points to
the presence of “nodal fossils”, meaning that humans evolved
gradually, as opposed to a sudden change
...
Evolution
is the result of changes in the genetic material of humans
...
Man originated through several stages:
Dryopethicus
It is the earliest known ancestor of man
...
The evolution of man began with him
...
Australopithecus
These were 1
...
They inhabited the
African mainland
...
Homo habilis
They were five feet tall and could make use of tools
...
Homo erectus
They were more evolved beings
...
They had a prominent speech
...
Homo sapiens
These are modern men
...
Their brain size was reduced
to 1300 cc
...
Today, scientists consider
Neanderthals to be more of a subspecies of humans rather than a
completely separate species
Title: Evolution of human
Description: In this notes you get a brief knowledge about human evolution throught out the time till now and their name.
Description: In this notes you get a brief knowledge about human evolution throught out the time till now and their name.