the incredible journey. what is evolution? evolution: change of the genetic composition of a...
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Human EvolutionThe Incredible journey
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What is Evolution?Evolution:Change of the genetic
composition of a population over successive generations
It is a result of natural selection acing on the genetic variation and resulting in the development of new species
Our earliest ancestors diverged from apes
Many humanlike species, called hominids, have lived on Earth
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What is Evolution?
Three principles involved;1. Microevolution
1. Occurrence and build up of mutations in the genetic sequence
2. Natural selection1. Natural mechanism 2. Fittest individuals survive long enough to breed and pass on
their genes3. “survival of the fittest”
3. Speciation1. Members of a species diverge/mutate to an extent that they
can no longer interbreed
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Are we just glorified monkeys?SimilaritiesGenetics (98%), physiology,
anatomySusceptible to the same
diseasesHave family groupsShow sexual dimorphismShow learnt behaviours
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DifferencesWe are bi-pedal (walk
on two feet)We are terrestrial
(living on the ground)Change towards
being omnivores (eat meat and vegetation)
Brain size increasedStarted using tools
Are we just glorified monkeys?
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Where did we come from?
Great Rift ValleyEarliest human remains found195 thousand years ago
Skhül cave (Israel)Oldest human remains found outside Africa100 thousand years agoSaharan forestClimate changes!Sahara and Saudi deserts become lush and forested125 thousand years ago
Evidence that the bodies were buriedandWith objects (shell beads)
This climate change also caused the sea level to fall30 km of sea became 11 km
Grunt, grunt grunt...
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Where did we come from?