Topic Summaries
Speciation
Transport Systems
Blood and heart disease
Stem cells, microscopy, and microorganisms
Transport in cells
Human health and enzymes
Plant transport systems
Pathogens and non-specific immunity
The immune system and drugs
Plant disease and monoclonal antibodies
Photosynthesis and respiration
The nervous system and homeostasis
The brain and the eye
Hormone regulation and waste excretion
Reproductive hormones and plant hormones
Cell division, reproduction, and DNA structure
DNA synthesis and inheritance
Genetic engineering and modification
Evolution and natural selection
Species and classification
Resource cycles and environmental change
Biodiversity and environmental management
Biomass and trophic levels
Food supply and biotechnology
Science skills: Experimental procedures
Science skills: Presenting and using data
Science skills: Measuring results
Transport Systems
Blood and heart disease
Stem cells, microscopy, and microorganisms
Transport in cells
Human health and enzymes
Plant transport systems
Pathogens and non-specific immunity
The immune system and drugs
Plant disease and monoclonal antibodies
Photosynthesis and respiration
The nervous system and homeostasis
The brain and the eye
Hormone regulation and waste excretion
Reproductive hormones and plant hormones
Cell division, reproduction, and DNA structure
DNA synthesis and inheritance
Genetic engineering and modification
Evolution and natural selection
Species and classification
Resource cycles and environmental change
Biodiversity and environmental management
Biomass and trophic levels
Food supply and biotechnology
Science skills: Experimental procedures
Science skills: Presenting and using data
Science skills: Measuring results
- Though Darwin is more widely appreciated, Alfred Russel Wallace independently proposed a theory of evolution by natural selection as well.
- He published joint writings with Darwin in 1858.
- This prompted Darwin to publish On the Origins of Species in 1859.
- Wallace worked worldwide gathering evidence for evolutionary theory.
- He is best known for his pioneering theory of speciation and his work on warning colouration in animals.
- More evidence over time has led to our current understanding of the theory of speciation, the gradual formation of a new species as a result of evolution.
- A population of a species is isolated in a different environment to the rest of the species.
- Different characteristics will be favourable for the survival of individuals in the isolated population as they are in a different environment to the rest of the species.
- The isolated population will evolve different characteristics to the rest of the species thanks to natural selection.
- Over time, the isolated population becomes so different from the rest of the species that they can no longer interbreed to form fertile offspring, so the isolated population has formed its own species.
- Evolutionary trees are a method used by scientists to show how they believe organisms are related. These trees use current classification data for living organisms and fossil data for extinct organisms.
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