Question

stabilizing selective pressures result in ______.
a. rapid, broad evolutionary changes
b. limited evolutionary changes
c. an increase in genetic diversity
d. extreme gene distributions

please select the best answer from the choices provided

a
b
c
d

Explanation:

⚡ Using what you learned: mechanisms of evolution and natural selection

Step 1: Understand stabilizing selection

Stabilizing selection is a type of natural selection that favors the intermediate (average) phenotypes in a population. Instead of favoring extreme traits, it selects against them.

Step 2: Analyze the effects on evolutionary change

Because stabilizing selection favors the status quo and eliminates extreme variations, it keeps the population's traits stable over time. This results in very little change in the overall characteristics of the species, meaning it leads to limited evolutionary changes.

Step 3: Evaluate the given options

• a. rapid, broad evolutionary changes: Incorrect, as stabilizing selection prevents drastic changes.
• b. limited evolutionary changes: Correct, because it maintains the average phenotype and reduces variation.
• c. an increase in genetic diversity: Incorrect, it actually decreases genetic diversity by weeding out extreme alleles.
• d. extreme gene distributions: Incorrect, it acts against extreme phenotypes.

Answer:

B