Recording-2025-01-22T17:50:21.812Z

Expresses the proportion of a specific allele within a population.
Example: 10% of individuals carry a specific allele.
Natural selection enhances fitness based on the allele frequency:
- Results in nonlinear relationships between allele frequency and fitness.
- Changes in the environment can alter this relationship (fitness landscape).

Preadaptations: Features that evolve for a particular environment but also provide benefits in different contexts.
- Example: Parrots are often frugivores, and a specific beak shape may be a preadaptation for fruit consumption.
Spandrels: Features that arise as artifacts rather than adaptations but later become beneficial.
- Example: Coiled snail shells.
  - Initially, the coiled structure was an artifact of evolution.
  - In marine environments, it provides a way for female snails to store eggs, reducing predation.

Adaptation refers to characteristics that increase an individual’s chances of success (fitness) in a given environment.
Fitness: Differential success among individuals.
- Some individuals exhibit higher fitness due to specific traits or alleles.

Prominent evolutionary theorist Richard Dawkins argues:
- Evolution is about preserving beneficial DNA segments.
- Evolution occurs through differential success among alleles.
Critique of Dawkins' Argument:
- His argument overly emphasizes genetic components without considering the individual organism.
- Individual success