GLOBAL WARMING
the increase of the global average temperature on Earth
Global Warming Displaces Species
Global Warming forces speciesto move into new eranges or alter habitats in ways that could disrupt the ecosystem.
Animals and plants that rely on one another were likely to migrate at different rates, leading to ecological disruption.
Will Lead to Health Hazards in the Furture
higher temperatures will excaberate respiratory ailments such as asthma and bronchitis
Major Tropical diseases likely to spread with an increase in tempteratures; Even a modest global tmeperature increase is epxected to extend the range of vectors
Mortality Rate of heat-related deaths will inrease with temperatures
Pollution in Ecosystems
Subtopic
Humans contribute to the aging of lake by increasing the nutrient level of the lake.
Human Sewage
Laundry Detergetn/Soaps runoff into water
-addition potassium into water
Farm Runoff (Fertilizer)
Greenhouse Effect
the trapping of heat in the atmosphere by certain (greenhouse) gases
Greenhouse Gases
methane
nitrous oxides
carbon dioxide
CFC's
water vapor
Loss of habitat
Leads to Species Extincitions
Hybridization
Hybridization can save an endangered species, but it can also make one go extinct .
can lead to genetic drift
Genetic Rescue- saving a species on the verge of extinction through hybridization
Species Introduction
Hunting
Exploitation
Abrupt Environmental Change
accounts for mass extinctions
Mass Extinction: 30-40% of species go extinct
POPULATION GENETICS
Hardy Weinberg Genetic Equillibrium:
p^2 + 2pq + q^2 = 1
-states genotype frequencies are constant from 1 generation to another
CONDITIONS OF
NO MUTATION
Mutation is the ultimate source of GENETIC VARIATION
Mutation: random changes in genetic code
NO SELECTION
RANDOM MATING
INBREEEDING
mating between relatives
NO MIGRATION
movement of genes between populations
migration=gene flow
GENETIC DRIFT
random changes in allele frequencies in a population from generation to generation
