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TB bacteria vary. When exposed to an antibacterial drug, some variants may tolerate it well, while others may not, due to the vagaries of their varying biochemistries. Those that do tolerate it will out-reproduce those that do not, and will tend to become more and more common variants. But further variation is being accumulated all the time. Along comes another drug, and the process repeats itself.
What else can I help you with?
What will produce adaptive changes in populations?
Natural selection
What process in which organisims with traits well suited to an environment are more likely to survive and to produce offspring is?
This process is called natural selection. It is the mechanism by which traits that provide a survival or reproductive advantage to an organism become more common in a population over time.
How are organisms with certain traits more likely to survive and produce offspring?
Natural selection
What would farmers use to produce vegetables that will grow in a specific climate?
natural selection
What does natural selection produce?
Natural selection produces adaptations in organisms that increase their fitness and survival in a given environment. Through the mechanism of natural selection, organisms with advantageous traits are more likely to survive and reproduce, leading to the gradual evolution of populations over time.
The process that discriminates between phenotypes with respect to their ability to produce offspring is known as?
Natural selection
How natural selection may have led some fungi to produce antiboitics?
Since natural selection also means the survival of the fittest, those organisms that produce antibiotics (against life) had a weapon to keep other organisms from taking their space that they needed to grow and reproduce.
How have different environments produce different species?
different environments produced different species by natural selection.
How have different environments produce different specis?
different environments produced different species by natural selection.
Is natural selection a cause of speciation?
Yes. Without natural selection there might probably still be change, but it would produce a fine gradient of diverging morphologies in every 'direction' of change. Natural selection limits the 'directions' of change, thereby producing distinct morphologies and thus distinct species.
Time why does natural selection continue to work?
Natural selection creates a stronger species that is able to live longer and produce more. It continues to work because after a few generations, the traits will become common in the population.
Why does natural selection continue work over time?
Natural selection creates a stronger species that is able to live longer and produce more. It continues to work because after a few generations, the traits will become common in the population.
