Darwin and natural selection Knowledge-Based Practice

Questions

1. 1.

   When developing his theory of evolution by natural selection, why did Charles Darwin place significant emphasis on artificial selection, such as the selective breeding of livestock and pigeons?

   • A) To demonstrate that environmental pressures induce new, purposeful traits directly within individual organisms
   • B) To show that selecting for existing heritable variations can produce significant phenotypic changes over generations
   • C) To prove that species possess an inherent biological drive toward structural complexity and perfection
   • D) To establish that natural populations reproduce without facing limits on food, space, or other resources
2. 2.

   According to Charles Darwin's theory of natural selection, which factor inevitably leads to a struggle for existence among individuals in a natural population?

   • A) The production of more offspring than available environmental resources can support
   • B) The deliberate effort of organisms to modify their body structures to meet ecological demands
   • C) The transmission of non-heritable physical traits acquired by parents during their lifetimes
   • D) The complete absence of phenotypic differences among individuals of reproductive age
3. 3.

   In the context of Darwin's theory of evolution by natural selection, how is an organism's biological fitness most accurately defined?

   • A) Its overall physical strength, speed, and lifespan relative to other members of the species
   • B) Its relative reproductive success in surviving and producing viable, fertile offspring
   • C) Its ability to acquire advantageous physiological traits during its individual lifetime
   • D) Its success in dominating social hierarchies and securing the largest physical territory
4. 4.

   According to Charles Darwin's theory of evolution by natural selection, what primarily causes certain traits to become more common in a population over successive generations?

   • A) Organisms intentionally acquire adaptive physical traits during their lifetime in response to environmental demands.
   • B) Changing environmental conditions induce beneficial genetic mutations across all members of a species simultaneously.
   • C) Individuals with advantageous variations survive and reproduce at higher rates than individuals lacking those variations.
   • D) The largest and physically strongest individuals in a population consistently outcompete other members regardless of the habitat.
5. 5.

   According to Charles Darwin's theory of evolution by natural selection, which condition is essential for natural selection to lead to evolutionary change within a population?

   • A) Heritable variation must exist among individuals, resulting in differential reproductive success.
   • B) Individuals must intentionally modify their physical traits during their lifetime in response to environmental need.
   • C) All individuals in the population must have identical genetic sequences and equal reproductive output.
   • D) Environmental conditions must remain completely constant over vast periods of geological time.

Answers and step-by-step solutions appear after you finish the test.