When reproducing, Robins (a species of bird) typically lay four eggs. Laying more eggs might result in malnourished chicks and laying fewer eggs might result in no viable offspring. This is an example of

Stabilizing selection is an evolutionary mechanism in which the extremes of traits are selected against, leading to an increase in the frequency of such traits in the population.

Laying too many eggs would lead to reduced fitness of the population of the bird as a result of malnutrition while laying too few eggs would lead to a reduction in the population. Reproduction needs to be optimized for maximum fitness.

marianaegarciaperedo marianaegarciaperedo · Answer 2 · 2022-01-18T12:27:00+01:00

There are different types of natural selection. One of them is stabilizing selection that favors the intermediate phenotype. The exposed scenario is an example of stabilizing selection.

Balancing selection, also called Stabilizing selection, decreases the frequency of individuals with extreme traits, and favors individual that exhibit medium-range characteristics, that gets to survive.

Selective pressure is against h0m0zyg0tes, promoting genetic diversity.

Genes expressing extreme characteristics in a h0m0zyg0sis are kept in a heter0zyg0us state, as a favorable adaptation to environmental conditions.

In a graph, you will see that

→ The curve gets higher and thinner in the middle of the horizontal axe, indicating an increase in the heter0zyg0us genotype frequency.

→ The tails of the curve that coincides with h0m0zyg0us dominant and recessive genotypes frequencies will be near zero.

In the exposed example,

laying more than four eggs and less than four eggs are extreme phenotypes.

laying four eggs is an intermediate favored phenotype.

The intermediate phenotype results in the species' fitness increase, so it is favored by natural selection.

Laying four eggs leads to well-nourished chicks, and all of them get to survive. Parents ensure their reproductive success.

You will learn more about stabilizing selection at

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