An organism has two different possible…

Biology Questions

An organism has two different possible traits, A and B. A graph of the population is shown on the right. Which of the following statements is true about Trait B? Check all that apply: It decreased in frequency over time, It became extinct, It is carried on a recessive allele.

Answer

Trait B is seeing a gradual decline over time primarily as a result of natural selection. This process can lead to microevolution, which involves changes in allele frequencies where more favorable alleles become predominant in the population. If this trend persists, less suitable alleles may eventually face extinction. While it is accurate that recessive traits tend to be rarer than dominant ones, a decrease in prevalence doesn’t inherently imply it’s due to the recessive nature of the allele. In some cases, a recessive trait might be better adapted to the environment, allowing it to thrive. Natural selection plays a key role in evolution, being the primary force that enables populations to adapt to their changing surroundings over time.

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