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Which of the following are possible about mutations?

A. Mutations may be beneficial and increase fitness.

B. Mutations may be neutral and have no effect on fitness.

C. Mutations may lower fitness by reducing survival or reproduction.

D. Mutations always affect organisms negatively.

Answer :

Final answer:

Mutations can be beneficial, neutral, or deleterious, affecting an organism's fitness in different ways. Beneficial mutations improve survival, neutral mutations have no significant effect, and deleterious mutations can reduce fitness. Understanding these types of mutations is essential to grasp how they contribute to evolution.


Explanation:

Understanding Mutations and Their Effects

Mutations are changes in the DNA sequence of an organism and can have varying effects on an organism's fitness, which is its ability to survive and reproduce. These effects can be classified into three main categories:

  • Beneficial Mutations: These increases in fitness can lead to better survival rates and reproductive success. For example, a mutation in mosquitoes that confers resistance to insecticides can significantly improve their survival in treated areas.
  • Neutral Mutations: Many mutations have no significant effect on fitness, often referred to as neutral mutations. These can occur without impacting the organism's ability to survive or reproduce.
  • Deleterious Mutations: Some mutations lower an organism's fitness, reducing the likelihood of survival or reproductive success. For instance, a mutation that results in a harmful trait may hinder an organism's ability to find food or escape predators.

It is critical to note that mutations do not always have negative effects; they can be neutral or even beneficial, contributing to the diversity and adaptability of populations over time.


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