Which of the following might we expect to INCREASE diversity within a population?I. Positive SelectionII. Negative SelectionIII. Balancing SelectionI & II onlyI onlyIII onlyAll of the above
Question
Which of the following might we expect to INCREASE diversity within a population?I. Positive SelectionII. Negative SelectionIII. Balancing SelectionI & II onlyI onlyIII onlyAll of the above
Solution
The answer is III only. Balancing selection is the only process among the three that increases diversity within a population.
Here's why:
I. Positive Selection: This process tends to decrease diversity because it favors one particular trait over others. As a result, individuals with this trait will become more common, reducing the overall genetic diversity in the population.
II. Negative Selection: This process also tends to decrease diversity because it eliminates individuals with certain undesirable traits. This leads to a reduction in the overall genetic diversity in the population.
III. Balancing Selection: This process increases diversity because it maintains multiple alleles in a population. It does this by favoring heterozygous individuals, who have two different alleles for a particular gene. This leads to an increase in the overall genetic diversity in the population.
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