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Lesson 2 – Evolution part 3
4 KEY EVOLUTION CONCEPTS
1. Climate Change + Environmental changes
2. Fossils being found (LUCY)
3. Foot-steps petrified in the Serengeti Plains
4. Mitochondrial DNA
Climate Change
1. Ice Ages happened many times in earth’s history
2. Last major glaciation 70,000 years ago lasted up to 12,000 years ago
3. COLD allowed TUNDRA (a treeless landscape)
Environmental Changes
As climate changes HOT – COLD COLD -HOT
animals and plants shift their range sometimes barriers - mountains, sea
CAUSED extinction
A great example of Fossil evidence is LUCY
Lucy was discovered in 1974 at Hadar in in Ethiopia. This discovery was
extraordinary and provided an enormous amount of scientific evidence. Lucy is
estimated to have lived 3.2 million years ago, and is classified as a hominin.
FOOTPRINT evidence
Hominin footprint at Ileret, Kenya. Photo of 1.5 million
year-old footprint (center) and color-contoured 3D laser
scan image (left)
Mitochondrial DNA
Human mitochondrial DNA was the first significant part of the human genome to
be sequenced. In most species, including humans, mtDNA is inherited solely
from the mother.
Lesson 4
4 BIG TIME CHANGES OVER TIME
1. Becoming Bi Pedial 6 million years ago
2. Dawn of Technology – TOOLS + TALKING 2.6 million years ago
3. Control of FIRE – 800,000 years ago
4. BURIALS + BRAIN size - 800,000 -200,000 years ago