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Biology

Grade-8

Easy

Question

Artificial selection decreases diversity. This is a disadvantage because:

Organisms with the same traits will refuse to reproduce with each other.
Organisms with all the same traits are susceptible to extinction.
Organisms with the same traits will be very aggressive.
Organisms with the same traits collectively get smarter and will someday rule the world.

hint Hint:

Artificial selection is not a natural process. Organisms having characters of choice are selected and breed together to produce offspring of desired characters.

The correct answer is: Organisms with all the same traits are susceptible to extinction.

So, similarities in organisms and lack of variety causes the risk of their extinction.

When selective breeding is performed in plants or animals since a long time. The organisms of a population will have lesser diversity and more similarity.
All the organisms of the population will have same traits as selective breeding is performed for this purpose (to achieve desirable characters which are beneficial for human.
So, this process does not support evolution. There will not be variety in organisms.
Varieties in organisms are required for them evolve.
These variations help them to adapt in the environment and survive.
Similar traits in organisms leads to the extinction of them.
Also, selective breeding causes several health-related problems in animals.

Related Questions to study

In the process of selective breeding of food crops, what might a farmer look for?

Selective breeding is performed to achieve desired characters in crops.
A farmer wants to develop such variety of crops with high yields and good nutritional value. So, the crop should be producing large sized grains and more grains in quantity.
So according to consumer's demand the farmer wants to produce a variety of crop which is disease resistant, to reduce loss in crop production.

In the process of selective breeding of food crops, what might a farmer look for?

Selective breeding is performed to achieve desired characters in crops.
A farmer wants to develop such variety of crops with high yields and good nutritional value. So, the crop should be producing large sized grains and more grains in quantity.
So according to consumer's demand the farmer wants to produce a variety of crop which is disease resistant, to reduce loss in crop production.

Artificial selection is used to create fruits, vegetables, and animals.

In the process of artificial selection, the two parental organisms are chosen with the traits of our choice, and when sexual reproduction is performed between them the produced offspring have desired characteristics from both parents.
So, it is used since ancient times and a variety of fruits, vegetables, and domestic animals are developed from this.
Different kind of broccoli is developed from wild mustard.
Seedless watermelons are successfully produced using this method.
A variety of dogs are obtained by selective breeding of wolves.

Artificial selection is used to create fruits, vegetables, and animals.

In the process of artificial selection, the two parental organisms are chosen with the traits of our choice, and when sexual reproduction is performed between them the produced offspring have desired characteristics from both parents.
So, it is used since ancient times and a variety of fruits, vegetables, and domestic animals are developed from this.
Different kind of broccoli is developed from wild mustard.
Seedless watermelons are successfully produced using this method.
A variety of dogs are obtained by selective breeding of wolves.

Is Mule a hybrid.

A mule is a hybrid.
It is produced when sexual reproduction is performed between a horse and a donkey.
So a horse and a donkey belong to different species. So they are distinctly related.
Such offspring are often sterile.
Mule has traits of both parents. Also it has more physical strength.

Is Mule a hybrid.

A mule is a hybrid.
It is produced when sexual reproduction is performed between a horse and a donkey.
So a horse and a donkey belong to different species. So they are distinctly related.
Such offspring are often sterile.
Mule has traits of both parents. Also it has more physical strength.

parallel

Problems with animals that are selectively bred include:

Selective breeding was developed in ancient times to get animal with desirable traits.
But since a long time, selective breeding in animals has caused lesser variety and more similarities.
Animals of a population are having same kind of traits according to human needs.
This causes rare genetic disorders in animals.
The animal has lesser potential to survive.
Along with beneficial traits some harmful traits can be passed to the next generation, so the animal may suffer from serious genetic disorder when harmful genes are expressed.

Problems with animals that are selectively bred include:

Selective breeding was developed in ancient times to get animal with desirable traits.
But since a long time, selective breeding in animals has caused lesser variety and more similarities.
Animals of a population are having same kind of traits according to human needs.
This causes rare genetic disorders in animals.
The animal has lesser potential to survive.
Along with beneficial traits some harmful traits can be passed to the next generation, so the animal may suffer from serious genetic disorder when harmful genes are expressed.

Inbreeding is when __________.

When two closely related animals like having most of similar characters, from same species or same breed are bred together, this is called inbreeding.
The produced offspring is homozygous.
Because both of the parents have same alleles at a locus.

Inbreeding is when __________.

When two closely related animals like having most of similar characters, from same species or same breed are bred together, this is called inbreeding.
The produced offspring is homozygous.
Because both of the parents have same alleles at a locus.

The purpose of selective breeding is to:

For selective breeding human selects organisms having traits that are beneficial for them.
So to get these traits in just one organism, a cross is performed between the selected animals.
This produced organism is having desirable traits and this is called artificial selection.
Since ancient times human has produced domestic animals and crop plants through selective breeding.

The purpose of selective breeding is to:

For selective breeding human selects organisms having traits that are beneficial for them.
So to get these traits in just one organism, a cross is performed between the selected animals.
This produced organism is having desirable traits and this is called artificial selection.
Since ancient times human has produced domestic animals and crop plants through selective breeding.

parallel

Offspring produced from two different parent types, breeds, or species

The offspring of two different parents that are from different breeds or species is called a hybrid.
Both parents of different types or breeds or species have different genetic compositions.
They are having different alleles for their genes.
So as a result of sexual reproduction the produced offspring is having different alleles at the same loci for a gene. They are heterozygous.
Also, these offspring have more new genetic combinations and thus more new traits.
So, that's why these are called hybrids.

Offspring produced from two different parent types, breeds, or species

The offspring of two different parents that are from different breeds or species is called a hybrid.
Both parents of different types or breeds or species have different genetic compositions.
They are having different alleles for their genes.
So as a result of sexual reproduction the produced offspring is having different alleles at the same loci for a gene. They are heterozygous.
Also, these offspring have more new genetic combinations and thus more new traits.
So, that's why these are called hybrids.

Which of the following best represents inbreeding?

The organisms which are closely related means have common ancestors and have many similarities in their genomes.
Because of the same genes most of their traits are similar too.
So, inbreeding represents crossing or sexual reproduction between similar animals.

Which of the following best represents inbreeding?

The organisms which are closely related means have common ancestors and have many similarities in their genomes.
Because of the same genes most of their traits are similar too.
So, inbreeding represents crossing or sexual reproduction between similar animals.

Which of the following is NOT a result of selective breeding?

Insects often match the color of the environment they live.
This is a kind of adaptation.
Matching with the color of the environment helps them to hide from the prey.
So, this kind of change is developed only through natural selection.
Because these traits help insects to survive.
So this can not be a result of selective breeding.

Which of the following is NOT a result of selective breeding?

Insects often match the color of the environment they live.
This is a kind of adaptation.
Matching with the color of the environment helps them to hide from the prey.
So, this kind of change is developed only through natural selection.
Because these traits help insects to survive.
So this can not be a result of selective breeding.

parallel

Problems with selective breeding include:

Selective breeding includes processes of inbreeding and hybridization.
This causes lesser diversity in animals.
The animals in a population have the same kind of traits and there will be a lack of variety.
The animals will not be able to evolve.
During natural selection, such changes or variations are developed in animal that helps them to survive in changing environments.
But in the absence of natural selection, such variations will not develop and they won't be able to survive in changing conditions.
So there will be health problems.

Problems with selective breeding include:

Selective breeding includes processes of inbreeding and hybridization.
This causes lesser diversity in animals.
The animals in a population have the same kind of traits and there will be a lack of variety.
The animals will not be able to evolve.
During natural selection, such changes or variations are developed in animal that helps them to survive in changing environments.
But in the absence of natural selection, such variations will not develop and they won't be able to survive in changing conditions.
So there will be health problems.

The image shows that the wolf is the ancestor to all the breeds of dogs shown below. How did this variation arise in a relatively short period of time?

Through a selective breeding variety of dogs are developed from a common wolf ancestor.
Through selective breeding or artificial selection, we can get new varieties in a short period as it is not a natural process.
For the domestication of animals, such varieties are developed from wild varieties of animals.

The image shows that the wolf is the ancestor to all the breeds of dogs shown below. How did this variation arise in a relatively short period of time?

Through a selective breeding variety of dogs are developed from a common wolf ancestor.
Through selective breeding or artificial selection, we can get new varieties in a short period as it is not a natural process.
For the domestication of animals, such varieties are developed from wild varieties of animals.

Artificial selection is ______.

Artificial selection was discovered and explained by scientist Charles Darwin in the 19th century.
But this process is not a new one and has been used for thousands of years ago.
Ancient humans developed different breeds of animals and plants from wild ancestors.
They developed breeds of animals for domestication and plants for crop production.
They were familiar with the results of inbreeding and hybridization.

Artificial selection is ______.

Artificial selection was discovered and explained by scientist Charles Darwin in the 19th century.
But this process is not a new one and has been used for thousands of years ago.
Ancient humans developed different breeds of animals and plants from wild ancestors.
They developed breeds of animals for domestication and plants for crop production.
They were familiar with the results of inbreeding and hybridization.

parallel

Identify the type of selection in the given image.

The variety of corns are developed through selective breeding.
Ancient human developed such breeds of corn according to their needs and benefits.
Through inbreeding and hybridization such varieties are developed.
These varieties are able to grow in different soil and climatic conditions. Also, these are resistant for water loss.

Identify the type of selection in the given image.

The variety of corns are developed through selective breeding.
Ancient human developed such breeds of corn according to their needs and benefits.
Through inbreeding and hybridization such varieties are developed.
These varieties are able to grow in different soil and climatic conditions. Also, these are resistant for water loss.

Identify the type of selection in the given image.

The given image represents that different animals evolved from the same ancestors, and become different in appearance due to migrating to different geographical areas like India, China, America, and Europe.
In the second generation, these animals are more varied.
These variations are caused by random mating in these animals.
These variations help these animals to adapt according to the environment.
So, natural selection can be noticed here as a result of random mating.

Identify the type of selection in the given image.

The given image represents that different animals evolved from the same ancestors, and become different in appearance due to migrating to different geographical areas like India, China, America, and Europe.
In the second generation, these animals are more varied.
These variations are caused by random mating in these animals.
These variations help these animals to adapt according to the environment.
So, natural selection can be noticed here as a result of random mating.

Artificial selection is also known as________.

Artificial selection is a process in which humans identify some desirable traits in organisms and through selective breeding, these traits are accumulated in the next generations of organisms.
Natural selection is caused by random mating while artificial selection is caused by selective breeding.
Human started the domestication of organisms that are beneficial to them many years ago. Some traits are useful for humans while some are not.
So, the process of artificial selection allows human to grow plants with desirable traits and to keep the domestic animals with desired traits.

Artificial selection is also known as________.

Artificial selection is a process in which humans identify some desirable traits in organisms and through selective breeding, these traits are accumulated in the next generations of organisms.
Natural selection is caused by random mating while artificial selection is caused by selective breeding.
Human started the domestication of organisms that are beneficial to them many years ago. Some traits are useful for humans while some are not.
So, the process of artificial selection allows human to grow plants with desirable traits and to keep the domestic animals with desired traits.

parallel

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