Darwin’s theory
Wednesday, 22 May 2019 08:59
Always a comparison between natural selection and Lamarck’s Based on 4 points
theory
1. There is variati
Eg. The evolution of giraffes neck individuals of m
Elephants trunk
Rhino’s horn - In case of pepp
Galapagos island tortoise, short and long neck Some members
camouflaging c
Adaptive radiation and divergent evolution
Example :
Different
environments. Much
dryer or much more
lush This is a pale mot
Common ancestor
Ancestral seed eating finch Distinct ecology and camouflaged with
environment so
animals and plants
evolved differently to Lichen grows in less
adapt to environment environment
On Galápagos
Island Finches diff to
Islands
those in Ecuador Therefore when indu
lichen died and trees
Beak adaption : evolutionary burning of fossil fuel
Species adapted as a whole (never say individuals). Cannot say - Pales moths th
‘they became adapted’ or ‘the bird changed’ because Lamarck predation (sel
All were seed eating, some had slightly longer, some had - Fewer moths g
shorter. So those seed eating finches which survived because therefore offsp
could find food passed on genes. Better adaptations to utilize genes
different food sources. Accumulation of food sources - Dark moths be
Become so different that they don’t interbreed as don’t population. Su
recognize, therefore new species arises. Survival of the fittest
comes in = micro-evolution
Speciation : accumulation of genetic changes which effect the How would Lamarck
phenotype over a long period of time. becoming dark beca
genes on
Darwin
Darwins Finches are
• Doctor and minister Local examples : Leo
• 20s was the resident naturalist on ship
Wednesday, 22 May 2019 08:59
Always a comparison between natural selection and Lamarck’s Based on 4 points
theory
1. There is variati
Eg. The evolution of giraffes neck individuals of m
Elephants trunk
Rhino’s horn - In case of pepp
Galapagos island tortoise, short and long neck Some members
camouflaging c
Adaptive radiation and divergent evolution
Example :
Different
environments. Much
dryer or much more
lush This is a pale mot
Common ancestor
Ancestral seed eating finch Distinct ecology and camouflaged with
environment so
animals and plants
evolved differently to Lichen grows in less
adapt to environment environment
On Galápagos
Island Finches diff to
Islands
those in Ecuador Therefore when indu
lichen died and trees
Beak adaption : evolutionary burning of fossil fuel
Species adapted as a whole (never say individuals). Cannot say - Pales moths th
‘they became adapted’ or ‘the bird changed’ because Lamarck predation (sel
All were seed eating, some had slightly longer, some had - Fewer moths g
shorter. So those seed eating finches which survived because therefore offsp
could find food passed on genes. Better adaptations to utilize genes
different food sources. Accumulation of food sources - Dark moths be
Become so different that they don’t interbreed as don’t population. Su
recognize, therefore new species arises. Survival of the fittest
comes in = micro-evolution
Speciation : accumulation of genetic changes which effect the How would Lamarck
phenotype over a long period of time. becoming dark beca
genes on
Darwin
Darwins Finches are
• Doctor and minister Local examples : Leo
• 20s was the resident naturalist on ship
