Edexcel IGCSE Biology · Spec 3.14-3.15
DNA, Genes and Chromosomes
The relationship between DNA, genes and chromosomes, and the structure of a DNA molecule.
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DNA, Genes and Chromosomes
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Spec 3.14-3.15
What you need to know
- Recall that chromosomes are found in the nucleus
- Link chromosomes, genes and DNA
- Define gene and genome accurately
Active recall
Quick check
Answer each question before opening the answer.
Define a gene and a chromosome.
A gene is a section of DNA that codes for a protein; a chromosome is a long DNA molecule carrying many genes.
Describe the structure of DNA.
A double helix of two strands held together by complementary base pairs: A with T, and C with G.
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