Cambridge IGCSE Biology
17.1Chromosomes, genes and proteins
Chromosomes, genes and proteins in Cambridge IGCSE Biology: what the syllabus expects you to know, the learning objectives and how to practise.
Subtopic44 practice questions2 lessons
Learning objectives
What the syllabus expects you to be able to do.
- 17.1.1State that chromosomes are made of DNA containing genes, and define a gene and an allele.
- 17.1.2Describe the inheritance of sex in humans using X and Y chromosomes.
- 17.1.3Supplement: explain how the base sequence of a gene determines the amino acid sequence and shape of a protein, and how DNA controls cell function through protein production.
- 17.1.4Supplement: explain how a protein is made using mRNA and ribosomes, and why cells express only some of their genes.
- 17.1.5Supplement: describe haploid and diploid nuclei and state that a human diploid cell has 23 pairs of chromosomes.
Lessons
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Chromosomes, genes and alleles
20 min
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Genes and protein synthesis
18 min
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