Podcast
Questions and Answers
Which of the following best describes Lamarck's Theory of Need?
Which of the following best describes Lamarck's Theory of Need?
- Organisms change randomly over time.
- Organisms inherit acquired characteristics.
- Organisms change in response to their environment. (correct)
- Organisms compete for limited resources.
According to Lamarck's Theory of Use and Disuse, what happens to organs that are not utilized?
According to Lamarck's Theory of Use and Disuse, what happens to organs that are not utilized?
- They remain unchanged.
- They become stronger.
- They develop new functions.
- They disappear. (correct)
What is the primary difference between Lamarck's and Darwin's explanations for the evolution of the giraffe's long neck?
What is the primary difference between Lamarck's and Darwin's explanations for the evolution of the giraffe's long neck?
- Lamarck proposed natural selection while Darwin proposed acquired inheritance.
- There is no difference in the two theories.
- Lamarck proposed that giraffes randomly changed, while Darwin proposed the use and disuse theory.
- Lamarck proposed that giraffes stretched their necks, while Darwin proposed variation and natural selection. (correct)
What is the mechanism behind natural selection according to Darwin?
What is the mechanism behind natural selection according to Darwin?
What does 'fitness' refer to, in the context of natural selection?
What does 'fitness' refer to, in the context of natural selection?
What role does variation play in the process of natural selection?
What role does variation play in the process of natural selection?
What concept of animal breeding did Darwin compare with Natural Selection?
What concept of animal breeding did Darwin compare with Natural Selection?
How did Darwin's observations on the HMS Beagle influence the theory of Natural selection?
How did Darwin's observations on the HMS Beagle influence the theory of Natural selection?
Flashcards
Lamarck's Theory of Evolution
Lamarck's Theory of Evolution
The idea that organisms change over time due to their needs and the use or disuse of their body parts.
Theory of Need
Theory of Need
The theory that organisms develop traits necessary for survival in their environment.
Theory of Use and Disuse
Theory of Use and Disuse
The theory that unused body parts will disappear and used parts will develop.
Theory of Acquired Characteristics
Theory of Acquired Characteristics
Signup and view all the flashcards
Natural Selection
Natural Selection
Signup and view all the flashcards
Fitness
Fitness
Signup and view all the flashcards
Variation
Variation
Signup and view all the flashcards
Selective Breeding
Selective Breeding
Signup and view all the flashcards
Study Notes
Lamarck's Theories of Evolution
- Lamarck proposed the first evolutionary theory, suggesting organisms change over time.
- Theory of Need: Organisms adapt to their environment, developing traits needed for survival.
- Theory of Use and Disuse: Unused organs diminish; used ones strengthen. Lamarck used the giraffe example; stretching necks to reach food made their necks longer, and this was inherited.
- Theory of Acquired Characteristics: Acquired traits during an organism’s lifetime are passed to offspring.
Darwin's Theory of Natural Selection
- Darwin's theory, developed 50 years after Lamarck's, differed significantly.
- Natural Selection: Giraffes with longer necks were better suited to survive and reproduce in environments with taller trees, leading to their increased frequency in the population. Short-necked giraffes would die out.
- Variation: Within a species, individuals have differing traits. This variation is crucial for natural selection.
- Environmental Factors: Natural selection occurs due to environmental pressures that favor some traits over others.
- Fitness: Fitness is the ability to survive and reproduce.
- Struggle for Existence: Organisms compete for resources (food, space).
- Natural Selection Process: Those with advantageous traits are more likely to survive and reproduce, passing their traits to offspring.
- Adaptation and Speciation: Adaptive traits increase chance of survival in changing environments. Reproductions leading to varied traits may eventually result in speciation, increasing biodiversity.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
Explore the contrasting theories of evolution proposed by Lamarck and Darwin. This quiz examines Lamarck's theories of need, use and disuse, and acquired characteristics against Darwin's concept of natural selection and variation. Test your understanding of how these foundational ideas shaped evolutionary biology.
