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Slide 1

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Biology Unit 2 Topic 4
Biodiversity and Natural
Resources…read more

Slide 2

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·Definition: measure of a variety of living organisms and
their genetic differences.
·The differences between certain organisms and a species,
between populations of the same type, between
communities and ecosystems. Every form of life have
specific characteristics depending on their genes.
·It is important because all organisms are interdependent
so they can affect each other's survival. If the biodiversity
is reduced in one area, the natural balance may be
destroyed in another area. It has allowed us to develop the
production of crops, livestock, fisheries and forests.
·Further improvements can be made to cross-breeding and
genetic engineering.…read more

Slide 3

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Definition: as a group of closely
related organisms that are able to
produce fertile offspring.
We can look at the morphology
(appearance) and the molecular
phylogeny (genetic make-up)…read more

Slide 4

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Binomial Nomenclature
First name is genus (capital letter)
Second name is species
Both in italic
e.g. Homo sapiens…read more

Slide 5

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Molecular Phylogeny and the 3
Biochemical analysis can either support or conflict with
relationships based on morphology. E.g. American
porcupines and African porcupines occupy similar niches
but have their biochemical analysis suggests that they're
only distantly related.
Many years it has been thought that there are 2 domains ­
prokaryotes and eukaryotes, this theory was that
eukaryotes were developed from prokaryotes. However,
now another domain is recognised, the Archaea.
The 3 domains are now known as Bacteria, Archaea and
Eukaryota. Genetics show that the 3 domains probably had
a single common ancestor 3 billion year ago. Archaea and
Eukaryota are thought to share a more recent common
ancestor with each other than Bacteria.…read more

Slide 6

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Ecology and Adaptation
Definition: the study of relationships between living
organisms and their environment.
The Niche Concept
An organism's niche is particular role in an ecosystem.
This includes;
-It's habitat (spatial)
-Feeding behaviour (keeping other populations in check)
-Interactions with other species
The interactions are competition, herbivory, predation,
parasitism, mutualism.…read more

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theres a wrong setnce in slide 23 its 'low genetic diversity due to not split off"

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