Evolution (video) | Khan Academy

Evolution is the process where heritable traits in a group of organisms change over many generations. This process is made possible by genetic variation. This variation, often resulting from sexual reproduction, leads to a range of traits within a population. Over time, small differences between organisms in a population can accumulate, leading to the evolution of new species.

Overzicht

Toegevoegd op

17 maart 2026

Vak & domein

life-health · evolution-natural-selection

Schooljaar

Groep 6–Klas 4

Paginatype

Video

Inleiding

  • Evolutionary Mechanisms:
    • Evolution describes how life changes over time, but it does not explain the origin of the first life.
    • Asexual reproduction can drive evolution through mutations that occur during mitosis, even without the recombination found in sexual reproduction.
    • Genetic traits (such as fingerprints) are unique to individuals, illustrating how specific variations persist within populations.
  • Biological and Psychological Concepts:
    • Emotions are a fundamental human trait rooted in brain function and biology; "emotional numbness" is distinct from a total lack of emotional capacity.
  • Cosmology and Earth Science:
    • Big Bounce Theory: A hypothesis suggesting the universe undergoes cycles of expansion (Big Bang) and collapse (Big Crunch).
    • Earth Formation: The planet formed through the accretion of debris around the sun via gravity.
  • Species and Adaptation:
    • Many modern species (including insects, sharks, and various plants) are descendants of organisms that lived during the age of dinosaurs.
    • Adaptation allows species to survive environmental changes, leading to the diversification of plant and animal varieties over time.
    • There is an approximate 166:1 ratio of flying bird species to flightless bird species.

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