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60 Cards in this Set

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  • Back
Weather and climate are environmental conditions that affect populations and are known as what?
density-independent factors
What are the three main patterns of dispersion in a population?
randomly spaced
evenly spaced
clumped distribution
In what do the range of phenotypes shift toward one extreme?
directional selection
What is human height an example of?
polygenic trait
What happens to growth rate in the exponential model of population growth?
remains constant
What kind of environment do K-strategists tend to live in?
stable and predictable
What does natural selection act on?
phenotypes
In large, randomly mating populations, the frequencies of alleles and genotypes remain constant from generation to generation unless what?
evolutionary forces act on the population
What can the Hardy-Weinberg principle do?
predict genotype frequencies
What consists of all of the individuals of a species that live together in one place at one time?
population
The plot of the phenotypes of a trait in a population is a hill-shapted curve. What does the trait exhibit?
normal distribution
What type of dispersion would barnacles crowded together on a rock exhibit?
clumped idspersion
What type of flow is created from migration to or from a population?
gene flow
What would demographers construct to predict how a population will grow which is a hypothetical population with the key characteristics of the real population being studied?
model
What would a female robin who chooses a male based on how well he sings her on a rock exhibit?
nonrandom mating
What tend to produce few offspring that mature slowly?
K-Strategists
What do you call the population size that an environment can sustain?
carrying capacity
What do you call a shift in allele frequencies in a population caused b random events or chance?
genetic drift
What features of the population would you examine if you were determining how the size of a population might change?
size
density
carrying capacity
dispersion
growth rate
In what type of growth curve does the growth rate remain the same even though the population size increases steadily?
exponential
What is a type of nonrandom mating that decreases the frequency of heterozygotes in a population?
inbreeding
The growth rate remains the same even though the population size increases steadily in a(n)_________growth curve.
exponential
Name the forces that cause populations to evolve. There are five.
1. mutation 2. gene flow
3. nonrandom mating 4.genetic drift
5. natural selection
___________consists of all the individual of a species that live together in one place at one time. Populations tend to grow because organisms often have multiple offspring over their lifetime. However, limited resources in an environment eventually limit the growth of a population.
A population
One of the most important features of any population is its ________ ___________.
population size
The number of individuals that live in a given area is called __________ __________.
population density
A third feature of populations which refers to the way the individuals of the population are arranged in space is _______________.
dispersion
What do demographers use when they try to predict how a population will grow?
population model
When the rate of population growth stays the same and population size is plotted against time on a graph, the population growth curve resembles a J-shaped curve called a(n) _____ _____ _____.
exponential growth curve
The population that an environment can sustain is called the ________ __________.
carrying capacity
As populations grow, limited resources get used up. These resources are called______ ______ ______ because the rate at which they become depleted depends on the density of the population that uses them.
density dependent factor
The ________ _________ is a population growth model in which exponential growth is limited by a density-dependent factor.
logistic model
Many species of plants and insects reproduce rapidly. Their growth is usually limited by environmental conditions, also known as ______ _______ _________.
density independent factors
Many species grow exponentially when environmental conditions permit their reproduction. Such species are called_______.Their offspring are small, mature rapidly, and receive little or no parental care.
r-strategists
Slow growing populations, such as whales and redwood trees, are called __________ because their population density is usually near the carrying capacity (K) of their environment.
K-strategists
According to the _____ _____ _____, the frequencies of alleles in a population do not change unless evolutionary forces act on the population.
Hardy Weinberg Principle
What is the movement of alleles into or out of a population?
gene flow
Sometimes individuals prefer to mate with others that live nearby or are of their own phenotype, a situation called _____ _____.
nonrandom mating
The frequency of an allele can be greatly changed by a chance event, such as a fire of landslide. This change in allele frequency is called _____ _____.
genetic drift
A trait that is influenced by several genes is called a(n) ________ _________.
polygenic trait
If you were to plot the height of everyone in your class on a graph, the values would probably form a hill-shaped curve called a(n) _____ _______.
normal distribution
When selection causes the frequency of a particular trait to move in one direction, it is called _____ _____.
directional selection
When selection eliminates extremes at both ends of a range of phenotypes, the frequencies of the intermediate phenotypes increase. This form of selection is called _______ ________/
stabilizing selection
According to the _____ _____ _____, the frequencies of alleles in a population do not change unless evolutionary forces act on the population.
Hardy Weinberg Principle
What is the movement of alleles into or out of a population?
gene flow
Sometimes individuals prefer to mate with others that live nearby or are of their own phenotype, a situation called _____ _____.
nonrandom mating
The frequency of an allele can be greatly changed by a chance event, such as a fire of landslide. This change in allele frequency is called _____ _____.
genetic drift
A trait that is influenced by several genes is called a(n) ________ _________.
polygenic trait
If you were to plot the height of everyone in your class on a graph, the values would probably form a hill-shaped curve called a(n) _____ _______.
normal distribution
When selection causes the frequency of a particular trait to move in one direction, it is called _____ _____.
directional selection
When selection eliminates extremes at both ends of a range of phenotypes, the frequencies of the intermediate phenotypes increase. This form of selection is called _______ ________/
stabilizing selection
According to the _____ _____ _____, the frequencies of alleles in a population do not change unless evolutionary forces act on the population.
Hardy Weinberg Principle
What is the movement of alleles into or out of a population?
gene flow
Sometimes individuals prefer to mate with others that live nearby or are of their own phenotype, a situation called _____ _____.
nonrandom mating
The frequency of an allele can be greatly changed by a chance event, such as a fire of landslide. This change in allele frequency is called _____ _____.
genetic drift
A trait that is influenced by several genes is called a(n) ________ _________.
polygenic trait
If you were to plot the height of everyone in your class on a graph, the values would probably form a hill-shaped curve called a(n) _____ _______.
normal distribution
When selection causes the frequency of a particular trait to move in one direction, it is called _____ _____.
directional selection
When selection eliminates extremes at both ends of a range of phenotypes, the frequencies of the intermediate phenotypes increase. This form of selection is called _______ ________/
stabilizing selection
Nagy and Wagner
Biology I
Chapter 16
Cut Apart and Study