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36 Cards in this Set
- Front
- Back
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population density
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*the number of individuals per unit area.
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Three important characteristics of population?
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1. geographic distribution
2. density 3. growth rate |
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Logistic growth
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*resource become less available, the growth of a population slows or stops.
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When a mutation happens to the coding section of DNA what happens?
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The faulty proteins are created.
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Threats to biodiversity
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*human activity can reduce biodiversity by altering habitats, hunting species to extinction, introducing toxic compounds into food webs, foreign species to new environments.
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Density-Independent Factors
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*Unusual weather, natural disasters, seasonal cycles, and certain human activities-such as dammning river and clear-cutting forests are all examples.
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carrying capacity
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*The number of species an environment can hold. Looks like a stable flat line on graph.
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exponential growth
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*occurs when the individuals in a population reproduce at a constant rate.
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Conservation
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*focuses on protecting the entire ecosystems as well as sngle species.
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Immigration
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*The movement of individuals into an area.
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What are some causes of mutations?
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sunlight, smoking, chemical spills,
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Does each person have their own unique DNA?
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Yes Then you can know who left a cell anywhere.
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Emigration
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*The movement of individuals out of an area.
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endangered species
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**a population size id declining in a way that places it in danger.
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endangered species
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*the population of an endangered species declines, the species loses genetic diversity.
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3 factors that affect population size
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1. number of births
2. number of individuals 3. enter or leave a population |
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habitat fragmentation
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*development that splits into ecosystems.
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Invasive species
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*reproduce rapidly.
*increase because their new havitat lacks the parasites and predators that control their population. |
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A decrease in nutrients in an ecosystem does what to the growth rate?
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Less nutrients (resources) will cause a decrease in growth rate.
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How do you do a karotype?
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To do a karotype take a picture of any cell of a person except sex cells (gametes)
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What is the basic unit of DNA?
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The basic unit of DNA is a nucleotides.
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Before a cell can divide what happens to the DNA?
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The DNA needs to be copied (called replication)
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Age structure diagrams
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*show the population of a country browken down by gender
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If a mutation happens in a gamete what will happen?
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It will pass on the mutation to the next generation. (Example: the disease: PKD)
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DNA has the code to tell cells how to make what?
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DNA has the code to tell cells how to make proteins.
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Information about your heredity is found where?
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Heredity is found coded in your DNA.
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Why can't chickens and finches interbreed (have babies together?)
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Chickens and finches can't interbreed because their DNA is different.
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Errors in copying and proofreading during replication cause what?
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Errors in copying and proofreading during replication cause mutations.
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How do you sequence DNA to it's complemntary strand?
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G to C; C to G; A to T; T to A;
ex. ACCTG becomes TGGAC |
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What causes growth in an organism?
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Things grow because cell division create more cells.
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All genetic disorders were originally caused by what?
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A mutaion of DNA
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Smoking can cause what?
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Mutation of lung cells. We call this cancer.
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THE 2 daughter cells do what with the original cytoplasm?
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They each get half of the cytoplasm.
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What kind of reproduction method does bacteria use ?
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Asexual
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What is cancer?
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Cancer is a mutation that causes uncontroled cell division
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If a mutation happens in any cell that is not a gamete cell what will happen?
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The mutation
will only affect the individual. |
