Published in the Formosa Journal of Science and Technology (FJST), the study highlights a growing challenge in science education: students may appear to understand genetics while still holding deeply rooted scientific misunderstandings that can affect future learning.
The findings matter beyond the classroom. Genetics increasingly shapes public understanding of health, biotechnology, personalized medicine, and scientific decision-making. Misunderstandings developed in school can persist into adulthood and influence how people interpret scientific information.
Why Genetics Remains Difficult to Learn
Genetics is one of the most conceptually demanding areas of biology because many of its processes cannot be directly observed. Students are expected to understand invisible molecular mechanisms while connecting abstract concepts such as genes, DNA, chromosomes, inheritance, and protein production.
Previous education studies have repeatedly shown that students often develop incorrect explanations about how genetic information works. Common misconceptions include believing that dominant traits are inherently stronger than recessive traits or misunderstanding how DNA influences inherited characteristics.
According to Delgra and Domingo, these misconceptions become especially problematic when students remain confident in incorrect explanations.
Measuring What Students Actually Understand
The researchers examined conceptual understanding among Grade 12 STEM students who had already completed foundational biology courses and were actively studying advanced biology content.
The study used a quantitative descriptive-comparative design and involved 152 students, selected through random sampling from a population of 332 Grade 12 STEM learners.
To evaluate understanding, students completed a specially designed assessment called the Genetics Conceptual Understanding and Misconception Test (GCUMT).
The assessment went beyond checking correct answers. Students were also asked to indicate how confident they were in each response using a Certainty of Response Index (CRI). This approach allowed researchers to distinguish between:
- students who genuinely understood concepts,
- students who lacked knowledge, and
- students who confidently believed incorrect explanations.
The distinction proved critical.
Strong Overall Performance, but Major Gaps Remain
Overall, students performed well in genetics.
The average conceptual understanding score reached 80.72 percent, placing students in the category of understands concepts.
Performance by topic showed important differences:
- DNA structure and proteins: 89.03%
- Patterns of inheritance: 88.17%
- Genetic engineering: 82.95%
- DNA replication and protein synthesis: 64.52%
The lowest score appeared in DNA replication and protein synthesis, suggesting that molecular processes remain substantially harder to understand than observable inheritance patterns.
Researchers noted that students appear more comfortable with genetics topics that can be visualized through examples and diagrams than with processes occurring at microscopic and molecular levels.
Misconceptions Persist Even Among Confident Students
One of the study’s most important findings was that incorrect answers were not always linked to uncertainty.
Many students selected wrong answers while expressing high confidence.
The analysis identified recurring misconceptions in several areas:
- relationships among DNA, genes, chromosomes, and proteins;
- dominant and recessive inheritance patterns;
- molecular structure and function of DNA;
- DNA replication mechanisms;
- protein synthesis processes;
- genetic engineering applications.
These findings suggest that students may retain fragmented pieces of knowledge without fully connecting them into scientifically accurate explanations.
Delgra and Domingo, drawing on educational theories of conceptual change, argue that misconceptions often develop when learners interpret new information through incomplete prior understanding rather than through structured scientific reasoning.
A Proposed Solution: Targeted Genetics Remediation
To address the learning gaps, the researchers developed a proposed instructional tool called the Genetics Misconception Remediation Worksheet (GMRW).
The worksheet is designed as a supplementary learning resource focused specifically on correcting misconceptions instead of repeating standard lessons.
Its activities include:
- guided Punnett square exercises;
- concept mapping;
- molecular labeling activities;
- DNA and protein visualization tasks;
- sequencing activities for replication and transcription;
- biotechnology case analysis;
- reflective learning exercises.
According to the authors, the goal is to help students rebuild scientific understanding through guided correction rather than memorization.
In educational practice, this model could help teachers identify not only whether students answer correctly but also whether their reasoning aligns with accepted scientific explanations.
The approach may also support schools seeking stronger scientific literacy outcomes and more effective STEM instruction.
Why the Findings Matter
As genetics becomes increasingly relevant in healthcare, biotechnology, and public policy discussions, improving conceptual understanding in secondary education becomes more important.
Students who misunderstand genetics concepts may later struggle with university-level science, health literacy, and evidence-based decision-making.
The study suggests that instructional methods emphasizing visualization, guided discussion, and conceptual reconstruction may offer stronger outcomes than traditional content delivery alone.
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