Question

The curve on the left shows the height of a population of penguins. The curve on the right shows the population five years later. What has happened to this population

Answer 1

Answer;

Stabilizing selection is the most appropriate

Explanation;

• Stabilizing selection is an example of natural selection or among the ways in which natural selection can have an effect in the variation of a population.
• Stabilizing selection would result to a decline in the genetic variance of a given population when natural selection tends to favor a certain phenotype against other variations that are extreme.
• For instance in the case of penguins,natural selection may favor those individuals that adapt well in the ocean and are less likely to be noted by predators. These are those penguins with distinct black and white coloring that blend in with the darkness of the ocean, thus they will survive and reproduce and pass these trait to their offspring. On the other hand those penguins without these characteristics may die as a result of predation by their enemies.

Answer 2

Stabilizing -or balancing- selection favors heter0zyg0us individuals over the h0m0zyg0us ones, increasing their frequency in the population. The correct option is B) Stabilizing selection.

What is stabilizing selection?

Balancing selection, or Stabilizing selection, favors heter0zyg0us individuals over h0m0zyg0us ones.

This selection eliminates individuals with extreme traits and increases the frequency of individuals that exhibit medium-range characteristics.

In these cases, selective pressures are against h0m0zyg0tes, promoting genetic diversity.

Genes that express the extreme characteristics when they are in a h0m0zyg0sis state, are only kept in heter0zyg0us genotypes as a favorable adaptation to environmental conditions.

So in the exposed example, you can see how the number of penguins with the intermediate phenotype increased, while the number of individuals expressing the shortest and tallest heighs decreased sharply.

The curve gor thinner and taller. The correct option is B) Stabilizing selection.

You will learn more about stabilizing selection at

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