Selective Pressure in Natural Selection

Play an AI-generated podcast conversation about this lesson

What is the definition of negative selection?

Occurs when selection reduces the frequencies of alleles that reduce fitness (correct)

Occurs when selection increases the frequencies of alleles that reduce fitness

Occurs when selection decreases the frequencies of alleles that increase fitness

Occurs when selection increases the Time frequencies of alleles that increase fitness

Which factor can be considered as an abiotic selective pressure?

Availability of limiting resources (correct)

Interspecies competition

Mating behavior

Intraspecies interaction

What happens to neutral traits under selective pressures?

They become beneficial

They remain unchanged as they don't affect fitness (correct)

They become detrimental

They become more pronounced

In positive selection, what is the impact on allele frequencies?

They increase Signup and view all the answers

What defines the strength of selective forces?

The degree to which an allele affects fitness Signup and view all the answers

Which best describes how selective pressure impacts allele frequencies?

It accelerates changes in allele frequencies Signup and view all the answers

What is the primary role of selective pressure in natural selection?

To produce organisms adapted to diverse environments Signup and view all the answers

What term describes the set of environmental conditions impacting survival of individuals in a population?

Selective pressure Signup and view all the answers

When selection reduces the frequencies of alleles that decrease fitness, it is known as:

Negative selection Signup and view all the answers

What type of interactions fall under biotic factors that can act as selective pressures?

Mating and competition Signup and view all the answers

What type of selection occurs when selection increases the frequencies of alleles that enhance fitness?

Positive selection Signup and view all the answers

Which statement regarding selective pressure is accurate?

It can interact or compete with other selective pressures. Signup and view all the answers

What determines whether selective forces are weak or strong?

Degree of fitness impact Signup and view all the answers

Which factor is NOT considered a form of selective pressure?

Genetic drift Signup and view all the answers

Which statement best describes how selective pressures can interact with each other?

Selective pressures can compete with and counteract the effects of other pressures. Signup and view all the answers

How does the strength of selective pressure impact the rate of change in allele frequencies and traits?

Allele frequencies and traits change faster when selective pressure is stronger. Signup and view all the answers

What is the relationship between selective pressure and the production of ideal organisms?

Selective pressure produces organisms that are adapted as much as possible to a specific environment, but not necessarily ideal. Signup and view all the answers

Which statement accurately describes how selective pressures can change over time?

Selective pressures can and do change in an environment over time. Signup and view all the answers

Which of the following factors is NOT a potential source of selective pressure?

Genetic drift, which is a random process unrelated to environmental factors. Signup and view all the answers

Under what circumstances would negative selection occur?

When selection reduces the frequencies of alleles that reduce fitness. Signup and view all the answers

Which statement accurately describes the impact of selective pressure on neutral traits?

Selection does not typically impact neutral traits because they don't change fitness. Signup and view all the answers

What term describes the process in which selection reduces the frequencies of alleles that decrease fitness?

Negative selection Signup and view all the answers

Which factor can act as a biotic selective pressure?

Competition within a species Signup and view all the answers

What type of interactions can be considered as abiotic factors affecting selective pressure?

Changing temperatures Signup and view all the answers

When would selection NOT typically impact neutral traits?

When they are not related to fitness Signup and view all the answers

What characterizes positive selection?

Increases the frequencies of alleles increasing fitness Signup and view all the answers

Which statement accurately describes the impact of selective pressure on allele frequencies and traits?

Both allele frequencies and traits change faster with stronger selective pressure Signup and view all the answers

What is the primary role of selective pressure within the context of natural selection?

To produce organisms adapted to specific environments Signup and view all the answers

Which statement accurately describes the relationship between selective pressure and the production of ideal organisms?

Selection produces organisms that are as adapted as possible to a specific environment, but not necessarily ideal. Signup and view all the answers

Which of the following scenarios would NOT result in negative selection?

A population of butterflies with camouflaging wing patterns experiences an increase in the frequency of alleles for those patterns due to increased predation. Signup and view all the answers

If a population experiences multiple selective pressures simultaneously, which statement accurately describes their interaction?

Multiple selective pressures can interact with and/or compete with each other. Signup and view all the answers

Which statement accurately describes the impact of selective pressure on neutral traits?

Selection does not typically impact neutral traits because they don't change fitness. Signup and view all the answers

If an allele confers a significant advantage in terms of fitness, what is the likely outcome?

The allele will experience strong positive selection, resulting in a rapid increase in its frequency within the population. Signup and view all the answers

Which statement accurately describes the impact of changing selective pressures on allele frequencies and traits?

Allele frequencies and traits change faster when selective pressure is stronger. Signup and view all the answers

Which of the following scenarios represents an example of an abiotic selective pressure?

A population of plants experiencing a decrease in available water due to a prolonged drought. Signup and view all the answers

If a population is experiencing two selective pressures, one favoring individuals with a specific trait and another favoring individuals without that trait, what is the likely outcome?

The stronger selective pressure will dominate, leading to a change in allele frequencies corresponding to that pressure. Signup and view all the answers

If a population experiences a sudden environmental change that renders a previously advantageous trait detrimental, what is the expected outcome over time?

The population will undergo negative selection, decreasing the frequency of the previously advantageous trait. Signup and view all the answers

If a population experiences a selective pressure that strongly favors individuals with a particular trait, what is the expected impact on the rate of change in allele frequencies and the expression of that trait?

The rate of change in allele frequencies and trait expression will be rapid, as strong selective pressures drive faster adaptation. Signup and view all the answers

In a population where a particular allele confers a significant advantage in terms of fitness, what is the expected outcome if a new, even more advantageous allele arises through mutation?

The original advantageous allele will be rapidly replaced by the new, more advantageous allele through positive selection. Signup and view all the answers

In a population experiencing multiple selective pressures, one favoring a trait that enhances survival and another favoring a trait that enhances reproduction, what is the expected outcome?

The population will undergo disruptive selection, leading to the emergence of two distinct subpopulations, each adapted to one of the selective pressures. Signup and view all the answers

If a population experiences a selective pressure that favors individuals with a particular trait, but that trait is also associated with a detrimental side effect, what is the expected outcome?

The population will undergo balancing selection, maintaining both the advantageous trait and the detrimental side effect. Signup and view all the answers

If a population experiences a selective pressure that favors individuals with a particular trait, but that trait is also associated with a neutral side effect that does not impact fitness, what is the expected outcome?

The population will undergo positive selection for the advantageous trait, and the neutral side effect will be maintained. Signup and view all the answers

Selective Pressure in Natural Selection

Choose a study mode

Podcast

Questions and Answers

What is the definition of negative selection?

Which factor can be considered as an abiotic selective pressure?

What happens to neutral traits under selective pressures?

In positive selection, what is the impact on allele frequencies?

What defines the strength of selective forces?

Which best describes how selective pressure impacts allele frequencies?

What is the primary role of selective pressure in natural selection?

What term describes the set of environmental conditions impacting survival of individuals in a population?

When selection reduces the frequencies of alleles that decrease fitness, it is known as:

What type of interactions fall under biotic factors that can act as selective pressures?

What type of selection occurs when selection increases the frequencies of alleles that enhance fitness?

Which statement regarding selective pressure is accurate?

What determines whether selective forces are weak or strong?

Which factor is NOT considered a form of selective pressure?

Which statement best describes how selective pressures can interact with each other?

How does the strength of selective pressure impact the rate of change in allele frequencies and traits?

What is the relationship between selective pressure and the production of ideal organisms?

Which statement accurately describes how selective pressures can change over time?

Which of the following factors is NOT a potential source of selective pressure?

Under what circumstances would negative selection occur?

Which statement accurately describes the impact of selective pressure on neutral traits?

What term describes the process in which selection reduces the frequencies of alleles that decrease fitness?

Which factor can act as a biotic selective pressure?

What type of interactions can be considered as abiotic factors affecting selective pressure?

When would selection NOT typically impact neutral traits?

What characterizes positive selection?

Which statement accurately describes the impact of selective pressure on allele frequencies and traits?

What is the primary role of selective pressure within the context of natural selection?

Which statement accurately describes the relationship between selective pressure and the production of ideal organisms?

Which of the following scenarios would NOT result in negative selection?

If a population experiences multiple selective pressures simultaneously, which statement accurately describes their interaction?

Which statement accurately describes the impact of selective pressure on neutral traits?

If an allele confers a significant advantage in terms of fitness, what is the likely outcome?

Which statement accurately describes the impact of changing selective pressures on allele frequencies and traits?

Which of the following scenarios represents an example of an abiotic selective pressure?

If a population is experiencing two selective pressures, one favoring individuals with a specific trait and another favoring individuals without that trait, what is the likely outcome?

If a population experiences a sudden environmental change that renders a previously advantageous trait detrimental, what is the expected outcome over time?

If a population experiences a selective pressure that strongly favors individuals with a particular trait, what is the expected impact on the rate of change in allele frequencies and the expression of that trait?

In a population where a particular allele confers a significant advantage in terms of fitness, what is the expected outcome if a new, even more advantageous allele arises through mutation?

In a population experiencing multiple selective pressures, one favoring a trait that enhances survival and another favoring a trait that enhances reproduction, what is the expected outcome?

If a population experiences a selective pressure that favors individuals with a particular trait, but that trait is also associated with a detrimental side effect, what is the expected outcome?

If a population experiences a selective pressure that favors individuals with a particular trait, but that trait is also associated with a neutral side effect that does not impact fitness, what is the expected outcome?

More Like This

Natural Selection and Mutations

Take the Natural Selection Quiz and Master Evolution

Ecology: Biotic and Abiotic Selection Pressures

Natural and Artificial Selection Flashcards