Population Dynamics Flashcards

1
Q

p + q =

A

1

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2
Q

5 things to maintain hardy weinberg equilibrium

A
  1. large population: losing an individual’s genes (genetic drift) has less of an effect on large populations that small ones
  2. random mating: mating by individuals is not determined by pheno/genotypes
  3. no mutations: changing alleles present in the pool
  4. no migration: movnt of alleles in/out (gene flow)
  5. no natural selection: no env’t factor favoring one genotype over another
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3
Q

p=

A

frequency of dominant allele in population

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4
Q

q=

A

frequency of recessive allele in population

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5
Q

p^2

A

% of homozygous dominant individuals (trait)

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6
Q

q^2=

A

% of homozygous recessive individuals (trait)

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7
Q

2pq=

A

% of heterozygous individuals (trait)

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8
Q

mutation (agent of gene pool change)

A

random changes in genetic sequences. A source of genetic variation for natural selection

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9
Q

gene flow (agent of gene pool change)

A

movement of individuals (alleles) from one population to another (immigration/ emigration)

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10
Q

non-random mating (agent of gene pool change)

A

preferred phenotypes, increases those genotypes in pool

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11
Q

Genetic drift (agent of gene pool change) 2 types

A

change in allele frequency in a breeding pop. due to random events. Small pop. may loose certain alleles (lack of mates, predation, etc): will have a greater impact on smaller groups

  1. Founder Effect: a pop (gene pool) that’s formed by a small group of individuals (founders) that carry a representation (limited gene pool) of the original pop’s genes
  2. Bottleneck Effect: quick reduction in pop (starvation, disease) causes a “bottleneck”, surviving pop produces less variant offspring
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12
Q

natural selection (agent of gene pool change)

A

some individuals are better able to survive & reproduce than others. The offspring carry the successful genes

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13
Q

speciation and 2 types of isolation

A

formation of a new species (lack of production of viable offspring)

  1. Geographic isolation
  2. Reproductive isolation
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14
Q

geographic isolation

A

separation of individuals of the same species by physical barriers (ie sea, mountains)

  • gene flow between 2 groups stops
  • eventually individuals of one pop. can no longer interbreed with the other
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15
Q

reproductive isolation

A

organisms in a pop can no longer mate to produce offspring, even though they live in similar envt
ex mutations not shared, mating seasons differ, reproductive organs

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16
Q

relationship where both organisms (of different species) benefit

A

mutualism

eg. bees and flowers

17
Q

commensalism

A

one organism benefits, the other is unaffected

eg. shark and remora

18
Q

parasitism

A

one organism benefits and the other (host) is harmed

eg. tapeworm and buffalo

19
Q

intraspecific competition

A

between members of the same species

20
Q

interspecific competition

A

between members of different species

21
Q

6 defense mechanisms (against competition and predation)

A
  1. camouflage
  2. mimicry
  3. biochemical (bitter/ toxic)
  4. armor (thorns)
  5. warning coloration
  6. behavioral
22
Q

succession

A

process of replacement of organisms by a more successful group following a disturbance
pioneer species re/colonize (moss) –> intermediate/ seral species more successful and replaces pioneers –> community stabilizes when climax (most successful) community presides (hardwood trees)

23
Q

primary succession

A

occurs where there was no pre-existing soil

- glacier retreat, volcanic eruption

24
Q

secondary succession

A

occurs where soil has pre- existed before disturbance

ie fire/ earthquake

25
carrying capacity (K)
the amount of individuals an envt can support based on resources etc
26
environmental resistance
all the limiting factors that keep a pop from growing at its biotic potential, and determine the carrying capacity
27
biotic potential
the max rate at which a pop can increase its size
28
density dependent
effect increases as population increases tend to be biotic ie food suppy, disease, competition
29
density independent
effect is the same regardless of pop size tend to be abiotic ie climate, natural disaters
30
4 phases of carrying capacity graph
1. lag phase (slow/ no growth) 2. growth phase: exponential rise in pop 3. plateau/ stationary phase: climax community 4. decline phase: resources lack
31
uniform pop distribution
order/ territories: competiton for resources
32
random pop distribution
no order, attraction, or repulsion among members (lots of resources)
33
clumped pop distribution
order; grouped in patches around an attraction | ie. watering holes/ to protect from predation (bison)
34
J-shaped curve graph (exponential or unrestricted growth)
r selected species (closed pops)
35
S shaped graph (logistic or restricted)
K selected species (open pops)
36
characteristics of r selected species
``` J shaped graph - small bodies - numerous - many offspring, no care for offspring - high mortality rate - reach reproductive age early - short life span eg bugs/ bacteria ```
37
characteristics of K selected species
``` S shaped graph - large bodies, fewer in #s - few offspring, which require care - low mortality rate - reach reproductive age late, long life span eg mammals, reptiles ```