Open Question
Some humans have genes that make them resistant to infection by HIV. Would human populations likely evolve differently in areas of the world where HIV infection rates are high? Explain your logic.
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1. Introduction to Biology
Natural Selection and Evolution
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which of the following is true of natural selection?
A
It requires genetic variation.
B
It requires selective pressure from the environment.
C
It involves differential reproductive success.
D
a, b, & c
Verified step by step guidance1
Understand that natural selection is a mechanism of evolution where organisms better adapted to their environment tend to survive and produce more offspring.
Recognize that genetic variation is crucial for natural selection because it provides the raw material for evolution. Without genetic differences, there would be no traits for natural selection to act upon.
Acknowledge that selective pressure from the environment is necessary for natural selection. This pressure can come from factors like predators, climate, or food availability, which influence which traits are advantageous.
Identify that differential reproductive success is a key component of natural selection. This means that individuals with advantageous traits are more likely to survive and reproduce, passing those traits to the next generation.
Combine these concepts to conclude that all three statements (genetic variation, selective pressure, and differential reproductive success) are true and essential components of natural selection.
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