Summary
Summary Biological diversity Grade 9
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The following document is a summary of the whole biological diversity unit which is taught to Grade 9 students
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- This can also occur because ofBiological diversity
environmental damages, such as,
What is biological
radiation and harsh chemicals
diversity?
- Migration
- Biological diversity refers to the variation of
- When a set of species move from one
species that live among an ecosystem or
population to another population
biome
they might bring genetic variation
Factors impacting
that is new to that area, the more
biodiversity
migration the more variation
- Climate
- Sexual reporduction
- Areas that have direct sunlight and
- Occurs when two different
stable temperatures as well as
organisms contribute genes to their
consistent rainfall generally tend to
offsprings
have a larger variation of species
- Latitude Variation within species
- When a group of animals are separated they
- Places with lower latitudes have a
start to develop unique genetic characteristics
higher biodiversity compared to
to survive in their respective areas they are
places with higher latitude. This is
classified as their own species
called Latitudinal diversity gradient
(LDG) Discrete traits
- Traits that have only two possible outcomes
- Landscape
- Example
- A landscape with a variety of
- There are only two types of
landform will have a higher
earlobes : attached and
biodiversity
detached
- Natural divisions
- These traits are controlled by one single gene
- Places with natural divisions, such as,
rivers impact the diversity. They Continuous traits
- Traits that have a range of phenotypes
prevent movement of the species.
- Example
When natural disasters occur species
- There are many heights one
are separated, this causes them to
can end up being
adapt to their environments and
- These traits are controlled by several
variety between species occurs
genes
How does variation occur
- Variation occurs for 3 reasons: Mutation of The risk of Less Variation
- If variation among the species is minimum
genes, gene flow (migration) and sexual
then the species have a higher risk of going
reproduction
extinct or not surviving a environmental
- Mutation of genes
disaster
- This occurs randomly when there is a
error in our genes Artificial selection
- When humans modify the genetics of an
offspring to give it desirable traits
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