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Environmental Science A > Measuring Populations > Flashcards

Measuring Populations Flashcards

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Biology 101 flashcards
1
Q

Distribution of species

A

the geographical area in which species is found

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2
Q

Types of distribution

A

regular
random
cluster

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3
Q

Regular distribution

A

occurs due to interactions with other individuals

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4
Q

An organism in regular distribution

A

cresote bushes

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5
Q

Random distribution

A

no pattern of interaction

rare in nature

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6
Q

Organism in random distribution

A

stingless bee

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7
Q

Cluster distribution

A

interaction with others/environment

most common type

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8
Q

Organisms in cluster distribution

A

herds of large mammals
social insects
migrating waterfowl
schools of fish

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9
Q

Types of population pyramids

A

expansive
constructive
stationary

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10
Q

Expansive population pyramid

A

high fertility rates
lower than average life expectancy
3rd world countries and Latin America

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11
Q

Constructive population pyramid

A

longer percentages of young people

United States

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12
Q

Stationary population pyramid

A

equal percentages of all age groups

European countries

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13
Q

Natural selection

A

mechanism of evolution

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14
Q

Types of natural selection

A

stabilizing selection
disruptive selection
directional selection

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15
Q

What happens to genetic diversity in stabilizing selection

A

genetic diversity decreases

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16
Q

Examples of organisms with stabilizing selection

A

medium-sized spiders

medium-sized mice

17
Q

What traits in a population are selected for in stabilizing selection

A

normal traits

18
Q

In stabilizing selection gene frequencies are kept……

A

constant

19
Q

In disruptive selection either…… in a population is selected for

A

extreme

20
Q

Disruptive selection eliminates ……..

A

intermediate traits

21
Q

What changes cause disruptive selection

A

disease
new predator
climate change

22
Q

What is a population distribution of age and gender graph

A

a back-to-back graph

23
Q

What does population distribution of age and gender show

A

number of males and females and age group pf each gender

24
Q

Directional selection

A

extreme variation of a trait within a population

25
Q

Examples of an organism that had directional selection

A

peppered moth

26
Q

Example of an organism that had disruptive selection

A

limpets

27
Q

The peppered moth experienced directional selection due to the ………. which caused……..

A

Industrial Revolution; industrial melanism

28
Q

Species can be distributed based on

A

native range
seasonal range
breeding range

Environmental Science A (26 decks)

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