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17.4 Selection
Define antibiotic resistance.
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17.4 Selection
The ability of bacteria to survive exposure to an antibiotic that would normally kill them.

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Define antibiotic resistance.

What does MRSA stand for?

The allele that gives bacteria antibiotic resistance arises due to a random โ€โ€โ€โ€โ€.

Why can antibiotic resistance develop very quickly in bacteria?

Which bacteria are more likely to survive when exposed to an antibiotic?

Surviving resistant bacteria โ€โ€ the allele for resistance on to their offspring.

True or False? The development of antibiotic resistance is an example of natural selection.

True or False? Bacteria become resistant because they choose to change in response to the antibiotic.

What happens to the number of resistant bacteria over many generations?

What must exist in a bacterial population before selection for resistance can occur?

Why do non-resistant bacteria die when exposed to the antibiotic?

How quickly can a resistant bacterial population develop?

Define artificial selection.

By what other name is artificial selection known?

Who selects the desirable characteristics in artificial selection?

In artificial selection, individuals with โ€โ€โ€โ€โ€ characteristics are chosen to breed.

What is the first step of selective breeding?

Why is the process of selective breeding repeated over many generations?

True or False? Artificial selection is carried out by the environment.

True or False? Selective breeding uses the principles of natural selection.

Selective breeding has produced many โ€โ€โ€โ€โ€โ€โ€ important varieties of plants and animals.

Give one example of an animal variety produced by selective breeding.

What is the main difference between natural and artificial selection?

After selecting parents with the desired characteristics, what is the next step?

Define natural selection.

Who first put forward the theory of natural selection?

By what other name is natural selection known?

Individuals with characteristics that are โ€โ€โ€โ€โ€โ€โ€ in their environment are more likely to survive and reproduce.

Why is there competition between individuals in a population?

What is passed on to offspring during natural selection?

Over many generations, the allele for an advantageous characteristic becomes more โ€โ€โ€โ€ in the population.

True or False? Natural selection can cause an individual to evolve within its lifetime.

True or False? The genetic variation that leads to natural selection occurs by chance.

What are the original sources of the genetic variation in a population?

Give one commonly used example of natural selection.

During natural selection, is it genes or alleles that are passed on?