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Evolution Grade 12 Life Sciences
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All Evolutionary notes. Diagram included. Evolution in time is shown.
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Evolution:Scientific theory of evolution emerges from different
lines of evidence:
Fossil records
Modification by descent
Evidence from biogeography
Genetics
As well as other forms.
1. Origin of an idea about origins:
What is evolution?
Gradual change or development of something.
Can be used in various sense in social or economic structures and general
use.
What is biological evolution?
change in gene pool of a population during course of time by such processes
as mutation, natural selection, and genetic drift.
Descent with modification.
Covers micro-evolution (within species) and macro-evolution (decent of diff.
species from common ancestor over many generations).
Why is it so important that we know about biological evolution?
Biological evolution:
- Has become unifying concept that acts as a foundation for understanding all
Biology
- Supports and explains many aspects of our everyday lives.
- Challenges people to really think for themselves.
How did life originate?
Current scientific opinion is that there was a single origin of life – this idea is
supported by the fact that all life shares the same genetic code and similar
basic enzymes, but science is still a long ay off from explaining how life
originated.
What is certain is that life on earth appeared very early – about 3.7 mya.
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