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35 Cards in this Set
- Front
- Back
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Study of demographics
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___________helps predict changes in size of population
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large populations
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What population is less likely to become extinct? (large or small)
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Wastes
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What accumulates in the environment as a population reaches its carrying capacity?
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Populations of K-strategists grow (rapid or slow)
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slow
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populations of r-stategists grow (rapid or slow)
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rapid
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Are mutations so common that they are the major cause of changes in allele frequencies within a population?
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No
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Natural selection acts on__________
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phenotypes
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Does natural selection always eliminate genetic disorders from a population?
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No
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The range of phenotypes shifting toward one extreme causes__________
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Directional selection
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n stabilizing selection does the range of phenotypes become wider?
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No
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Do all the birds in Clarkston represent a population?
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NO
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Why do population sizes increase?
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individuals tend to produce more than one offspring
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Is the increase in the diversity within a population a problem arising from inbreeding?
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No
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Demographic studies of populations must take into consideration:
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1. production of a genetically uniform population.
2. reduction of populations ability to adapt to environmental changes |
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Population dispersion improper pairing examples:
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1. randomly spaced - chance
2. evenly spaced - regular 3. clumped - clusters |
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logistic growth is_________
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how population grown in nature
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As a population reaches its carrying capacity, there is an increase in competition for....
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food, shelter, mates, ect.
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charactoristics of r-strategist
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Environments that are 1.unpredictable 2.rapidly changing 3.early maturation 4. early reproduction 5. little parental care
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example of r-strategist
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dandelions (weeds)
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charactoristics of K-strategist
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1. reproduce late in like
2. require a lot of parental care |
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Gene flow
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movement of alleles into or out of a population due to migration
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Inbreeding
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increases the proportion of homozygotes
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Natural selection acts on ________
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all mutations
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Directional selection tends to eliminate ____________
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one extreme in a range of phenotypes
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Population
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consists of all the individuals of a particular species in a particular place
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Demography
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statistical study of all populations
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Dispersion
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way that members of a population are arranged in a given area
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Population Model
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hypothetical population that has key characteristics of the real population being studied
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Growth rate
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difference between the birth rate and death rate of population
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Carry capacity
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population size that can be sustained by an environment
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Alleles
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Alternative versions of genes
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Migration
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movement of individuals from one population to another
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Migration creates __________
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Gene flow
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polygenic trait
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A characteristic influenced by several genes
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Stabilizing selection
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causes range of phenotypes to become narrower, increasing the number of individuals with characteristics near the middle of the range
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