DO NOW:
What is the energy used to power all cellular activities?
What is selective breeding?
What are the building blocks of proteins?
Name a female hormone:
What is the purpose of the placenta?
Why is the embryo at the greatest risk during the first 8 weeks of life?
What is meiosis?
TAG CTA <-- Translate this into mRNA:
Name a feedback mechanism that occurs in the human body:
What color does starch indicator turn in the presence of starch?
Ecology:
• Study of both biotic and abiotic factors interacting
– BIOtic- living- plants, animals, foods, mates
– Abiotic- Nonliving- sunlight, soil, pH, temperature, water
Ecology:
• Study of both biotic and abiotic factors interacting
– BIOtic- living- plants, animals, foods, mates
– Abiotic- Nonliving- sunlight, soil, pH, temperature, water
• The growth and survival of organisms depends on
the conditions of the environment
• If an organism is not adapted for an environment, it
will not be able to compete for resources.
• The carrying capacity of an ecosystem is the maximum
number of species that can be supported.
• The more resources there are, the higher the carrying
capacity
• The less resources there are, the lower the carrying
capacity
• The carrying capacity can change from year to year
Biodiversity
Biodiversity
• Because of evolution, there are many different
types of life.
• Biodiversity is the amount of different species in an
area
Biodiversity
• Farms have NO biodiversity, because they focus on
1 or 2 species.
• Rainforests have a lot of biodiversity, because there
are so many different types of life living there.
***Why is biodiversity important?***
• Biodiversity increases the STABILITY of an
ecosystem
• The more biodiversity there is, the more genetic
diversity there is.
– Genetic diversity increases the chances of survival!!
• Biodiversity may lead to discoveries in agriculture
and medicine!
Ecological Succession
• Biodiversity does not happen overnight.
• Stable ecosystems are built over time through
ecological succession.
• A stable ecosystem cab be destroyed by natural
disasters (fire, volcano) or by human activity
(deforestation)
• Each step of ecological succession modifies or
changes the environment to make it more suitable
for other organisms to move in.
*Less Stable
*Less Biodiversity
*More Stable
*More biodiversity
Roles in the ecosystem
•
•
•
•
•
•
•
•
HeterotrophAutotrophProducerConsumerDecomposerPredatorPreyParasite-
Roles in the ecosystem
•
•
•
•
•
Heterotroph- relies on others for food
Autotroph- makes its own food
Producer- makes its own food
Consumer- eats food
Decomposer- breaks down dead organisms and
recycles nutrients/compounds back into the soil
• Predator- hunter
• Prey- hunted
• Parasite- causes harm to host
Energy in the Ecosystem
• All energy starts with the sun, but only producers
are able to use this energy
– Photosynthesis
• Energy flows in one direction only
• Chemical energy is passed in a food chain
• Organisms use chemical energy to make ATP
– Cellular Respiration
• ATP is never transferred!!!!
• ATP energy is used and LOST to the environment
as heat!