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812
Analyze data on levels of variation
within a population to make
predictions about survival under
particular environmental conditions.
Analyze data on levels of variation within a
population to make predictions about survival
under particular environmental conditions.
Key concepts/skills:
Level 1: Define key vocabulary.
Level 2: Identify the four parts of natural
selection. Explain why genetic variation is
important.
Level 3: Given data that shows population
variation, explain the environmental pressures
or adaptations that are affecting population
growth.
Analyze data on levels of variation within a
population to make predictions about survival
under particular environmental conditions.
Key vocabulary:
Population (review)
environmental pressures
competition
Natural selection
limits on populations
predation
Genetic variation
genetic bottleneck
starvation
Population variation
adaptation (review)
Analyze data on levels of variation within a
population to make predictions about survival
under particular environmental conditions.
I.
Populations
A. Individuals of the same species living in the same area
1. Population Variation – natural increases and
decreases in the number of individuals in a population
2. Genetic Variation – variation in the traits of a
population (all humans look different)
3. Adaptations – any trait that increased the survival
and reproduction of a species
Analyze data on levels of variation within a
population to make predictions about survival
under particular environmental conditions.
II. Limits on Population
A. The following limit populations
1. Environmental Pressures
a. Food, water, seasons, weather
2. Predation – predators and prey limit
one another’s pop.
3. Competition – organisms compete for
food, mates, and space
4. Disease – communicable diseases limit a
population
Analyze data on levels of variation within a
population to make predictions about survival
under particular environmental conditions.
III. Natural Selection
A. 4 Stages of Nat Sel.
1. Overpopulation – More offspring are
born than will live to become adults
Analyze data on levels of variation within a
population to make predictions about survival
under particular environmental conditions.
2. Genetic Variation – individuals have
different traits in a population
Analyze data on levels of variation within a
population to make predictions about survival
under particular environmental conditions.
3. Struggle to survive – environmental
pressures, competition, and predation take
their toll on the population
Analyze data on levels of variation within a
population to make predictions about survival
under particular environmental conditions.
4. Successful Reproduction – only the individual
that survives the pressures on the population
reproduce
Analyze data on levels of variation within a
population to make predictions about survival
under particular environmental conditions.
B. Genetic Bottlenecking – large variety in a
population suddenly disappears becase of
many pressures on the pop.
Analyze data on levels of variation within a
population to make predictions about survival
under particular environmental conditions.
Population with
Genetic Variation
*Environmental
Pressures
*Competition and
*Predation
Natural Selection