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In a population of bacteria reproducing asexually, adaptive traits like heat resistance can emerge through mutations and natural selection, even without direct sexual reproduction. Here’s how the process works:
1. Mutation: When bacteria reproduce, random mutations occasionally occur in their DNA. Some mutations may provide beneficial traits, such as heat resistance. While rare, if a mutation for heat resistance arises, it can offer an advantage in hot environments.
2. Selection: If the bacteria are exposed to heat over generations, those with the heat-resistant mutation will have a survival advantage, allowing them to thrive while others perish.
3. Proliferation of Advantageous Traits: Since bacteria reproduce quickly and can create numerous generations in a short time, beneficial mutations (like heat resistance) spread rapidly through the population. By the seventh generation, many bacteria may carry the heat-resistant trait.
In this way, through mutation and selection, an initially absent trait like heat resistance can become common in later generations.
Even though bacteria reproduce asexually, they don’t remain unchanged across generations. In the original population, some bacteria likely had small random mutations that made them slightly more heat-tolerant, even if the trait wasn’t obvious at first. When exposed to heat, most bacteria died, but these few survived.
Since bacteria reproduce by cloning, the survivors passed this heat-tolerant trait to their offspring. By the seventh generation, most of the population descended from these survivors, making heat tolerance appear like a new trait. In reality, it’s the result of natural selection acting on random mutations, not learning or intentional adaptation.