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The contents of bacterial
cells are usually hypertonic
, so water moves in by
What is a species?
A group of closely related organisms that are all
potentially capable of interbreeding to produce
fertile offspring.
A group of organisms where gene flow can occur
between individuals.…read more

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Allopatric speciation
When populations are physically
separated (geographical isolation).
Results in a geographical barrier to
interbreeding…read more

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Sympatric speciation
When populations are geographically still close to
each other.
No geographical barrier to interbreeding.…read more

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Prezygotic reproductive
Prevents fertilisation.
Habitat isolation
Temporal isolation
Mechanical isolation
Behavioural isolation
Gametic isolation…read more

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