Darwin's Theory of Natural Selection
Proposes that evolution occurs through natural selection, where individuals with advantageous heritable traits survive and reproduce more successfully.
What is Darwin's Theory of Natural Selection?
The process whereby organisms better adapted to their environment tend to survive and produce more offspring.
Key points
- Explain the core principles of Darwin's theory of natural selection.
- Differentiate between variation, struggle for existence, and natural selection.
- Describe how natural selection leads to adaptation.
- Understand the role of heritability in evolution.
Common exam trap
Confusing 'survival of the fittest' with mere physical strength; 'fittest' refers to reproductive success in a specific environment.
Definitions
- Term
Natural Selection
- Meaning
The process whereby organisms better adapted to their environment tend to survive and produce more offspring.
- Term
Variation
- Meaning
The differences in characteristics between individuals of the same species.
- Term
Struggle for Existence
- Meaning
The competition among organisms for limited resources necessary for survival.
- Term
Adaptation
- Meaning
A trait that increases an organism's survival and reproductive success in its specific environment.
- Term
Fitness (Biological)
- Meaning
The relative ability of an organism to survive and reproduce in its environment, measured by its contribution to the gene pool of the next generation.
Learning objectives
Explain the core principles of Darwin's theory of natural selection.
Differentiate between variation, struggle for existence, and natural selection.
Describe how natural selection leads to adaptation.
Understand the role of heritability in evolution.
Appreciate the significance of Darwin's theory in explaining biodiversity.
Prerequisites
Basic understanding of heredity and genetics (genes, alleles, inheritance patterns).
Concept of variation within populations.
Understanding of environmental factors and adaptation.
Common mistakes
Confusing 'survival of the fittest' with mere physical strength; 'fittest' refers to reproductive success in a specific environment.
Believing that individuals evolve; evolution occurs at the population level over generations.
Thinking that evolution has a 'goal' or 'direction'; it is driven by environmental pressures.
Assuming that acquired characteristics are inherited (Lamarckian inheritance).
Overlooking the role of random genetic drift in evolution.
Keywords
Evolution
Natural Selection
Charles Darwin
Alfred Russel Wallace
Variation
Struggle for Existence
Survival of the Fittest
Adaptation
Heritability
Speciation
Differential Reproduction
Practice preview
What is the primary mechanism proposed by Charles Darwin for the process of evolution?…
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Which of the following is a fundamental premise of Darwin's theory of natural selection?…
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A population of deer lives in a forest. A new predator is introduced, which primarily hunts slow-moving deer. Over several generations, the average speed of the deer population increases. This change is best described as…
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