What is the role of natural selection in evolution?
o a. natural selection is a specific mechanism of evolution in which the heritable traits (characteristics) an organism to survive his generation
ob. natural selection is a specific mechanism of evolution in which the heritable traits (characteristics) an organism to survive and reproduce
successfully
oc. natural selection is a specific mechanism of evolution in which all acquired traits (characteristics) an organism to survive and reproduce
successfully.

Which of the following occurs most often in a population when genetic variation and overproduction are present? some organisms have a lower reproductive success than others. some organisms have a higher reproductive success than others. some organisms have no reproductive success. some organisms do not have genetic variation.

Keeping in mind the life cycle of bacteriophages, consider the following problem: during the reproductive cycle of a temperate bacteriophage, the viral dna inserts into the bacterial chromosome where the resultant prophage behaves much like a trojan horse. it can remain quiescent, or it can become lytic and initiate a burst of progeny viruses. several operons maintain the prophage state by interacting with a repressor that keeps the lytic cycle in check. insults (ultraviolet light, for example) to the bacterial cell lead to a partial breakdown of the repressor, which in turn causes the production of enzymes involved in the lytic cycle. as stated in this simple form, would you consider this system of regulation to be operating under positive or negative control?

Adoença vitiligo afeta qual doença do corpo?