A population of bacteria exhibits variation in antibiotic resistance traits. Arrange the following events describing the evolutionary process of antibiotic resistance according to Darwin's theory of natural selection in the correct chronological sequence, from first to last.
- 1Random genetic variations produce differences in antibiotic tolerance among individual bacteria prior to exposure.
- 2Rapid bacterial reproduction generates a large population size competing for limited host resources.
- 3The introduction of an antibiotic kills non-tolerant bacteria while individuals possessing resistant traits survive.
- 4Surviving resistant bacteria reproduce and transmit their beneficial resistance genes to the next generation.
- 5The proportion of resistant individuals increases over successive generations, producing an adapted population.
Cevap
The correct chronological sequence is: 1) Pre-existing variation in resistance traits, 2) Overproduction leading to competition, 3) Antibiotic selection causing differential survival, 4) Inheritance of resistance traits through reproduction, 5) Shift in population trait frequency.
Darwin's theory of natural selection operates through a strict logical progression. First, pre-existing variations arise spontaneously in the population. Second, overproduction of offspring leads to competition for limited resources. Third, an environmental selective agent (such as an antibiotic) causes differential survival, favoring individuals with advantageous traits. Fourth, survivors reproduce and transmit these traits to their offspring. Finally, over multiple generations, the trait frequency shifts, resulting in population adaptation.
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Darwin's Theory of Natural Selection (Logical Sequence)