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Genetic variation is the diversity in DNA sequences found among individuals of the same species. This diversity is crucial for a species' survival because it helps organisms adapt to environmental changes. Genetic variation begins with fertilization, where an egg and sperm cell merge. Each of these cells carries 23 chromosomes, up to 46 in the fertilized egg. Chromosomes are long DNA strands that contain genes, the basic units of heredity.
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Crossing the Threshold: Bringing Biological Variation to the Foreground.

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Threshold concepts, like variation, are crucial for biology competency but often untaught. Understanding variation can transform student learning in genetics and evolution.

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Area of Science:

  • Biology Education
  • Genetics
  • Evolutionary Biology

Background:

  • Threshold concepts are critical, transformative ideas essential for discipline mastery.
  • In biology, variation is a proposed threshold concept impacting core areas like genetics and evolution.
  • Existing frameworks guide curriculum development, but integrating threshold concepts offers new pedagogical insights.

Purpose of the Study:

  • To explore the utility of threshold concepts in guiding biology instruction and curriculum design.
  • To examine the specific threshold concept of variation and its potential impact on student understanding of genetics and evolution.
  • To propose a schema for teaching variation to foster deeper learning in biology.

Main Methods:

  • Literature review and conceptual analysis of threshold concepts in biology.
  • Examination of the proposed threshold concept of variation.
  • Development of a schema based on dimensions of scientific inquiry for teaching variation.
  • Connecting variation to core concepts in genetics and evolution.

Main Results:

  • Variation is identified as a key threshold concept that can significantly influence student comprehension of genetics and evolution.
  • A schema using scientific inquiry dimensions is proposed to help students experience and apply the concept of variation.
  • Integrating threshold concepts with existing frameworks like Vision and Change can enhance targeted instruction.

Conclusions:

  • The concept of variation, when treated as a threshold concept, can fundamentally improve student learning in genetics and evolution.
  • The proposed schema offers a practical approach for educators to foster a deeper understanding of variation.
  • Adopting a threshold concept lens alongside Vision and Change core concepts can bridge conceptual understanding and competency in biology.