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Evolution
- Variation
- Intraspecific variation is
variation within a species.
Interspecific variation is
variation between species.
- Continuous
variation: Mass,
height, length
- Discontinuous
variation: Sex,
blood group,
colour, shape
- Discontinuous
variation: Sex,
blood group,
colour, shape
- Genetic factors
- Different species
have different genes
- Same species,
same genes but
different version
- Same species,
same genes but
different version
- Inherit gene from
parents, variation
caused by genetic factor
is inherited
- Different species
have different genes
- Environmental
- Differences in the
environment: climate,
food, lifestyle
- Accents, piercings
- Differences in the
environment: climate,
food, lifestyle
- Both (genetic
and
environmental)
- Height: diet and
nutrition contribute
as well as
inheritance
- Flagellum: grow in
certain environments, if
metal ions are present
- Height: diet and
nutrition contribute
as well as
inheritance
- Intraspecific variation is
variation within a species.
Interspecific variation is
variation between species.
- Adaptions
- Increases the organisms chances of
survival and reproduction and also the
chances of its offspring reproducing
successfully.
- Adaptation develop because of natural selection
- Best adapted individuals
are more likely to survive
and reproduce, passing
adaptations to their
offspring.
- Adaptation develop because of natural selection
- Behavioural
- Ways an
organism acts
that increase
its chance of
survival.
- Ways an
organism acts
that increase
its chance of
survival.
- Physiological
- Processes inside an
organism's body that increase
its chance of survival
- Processes inside an
organism's body that increase
its chance of survival
- Anatomical
- Structural features of an
organism's body that increases its
chance of survival
- Structural features of an
organism's body that increases its
chance of survival
- Increases the organisms chances of
survival and reproduction and also the
chances of its offspring reproducing
successfully.
- Theory of evolution
- Darwins theory
- Individuals within
a population show
variation in their
phenotypes.
- Predation, disease
and competition
create a struggle for
survival
- Individuals with
better adaption
survive longer
- Number of individuals
with the advantageous
adaption increases
- Over
generation it
leads to
evolution
- Individuals within
a population show
variation in their
phenotypes.
- Speciation
- When populations of the
same species evolve to
become so different that
they can't breed to
produce fertile offspring
- When populations of the
same species evolve to
become so different that
they can't breed to
produce fertile offspring
- Evidence to
support evolution
- Fossil record evidence
- DNA evidence and
common ancestors
- Molecular
evidence such
as proteins
- Fossil record evidence
- Resistance to
antibiotics and
pesticides
- By natural selection. There is a
variation in a population of
bacteria/pests. Genetic mutation
make some bacteria/pests
resistant to an antibiotic/pesticide.
Some will survive and pass
genes on generations
- Infections caused
by antibiotic
resistant bacteria
are harder to treat.
- Crop infestations with
pesticide resistant
pest are harder to
control.
- Disease carrying
pest become
pesticide resistant,
disease will be
harder to control
- Disease carrying
pest become
pesticide resistant,
disease will be
harder to control
- Infections caused
by antibiotic
resistant bacteria
are harder to treat.
- By natural selection. There is a
variation in a population of
bacteria/pests. Genetic mutation
make some bacteria/pests
resistant to an antibiotic/pesticide.
Some will survive and pass
genes on generations
- Darwins theory
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