A Level Biology Revision Lesson 54: Chromosome Structure.

Task 1. Check Where this Lesson fits into your Exam Specification!

Task 2. Watch the Revision Notes Lesson in Full.

Download the accompanying Revision Notes (A3 PDF)


Check Your Spec!

★ AQA Specification Reference: - 3.2 Cells: nucleus (containing chromosomes, consisting of protein-bound, linear DNA). 3.4.1 DNA, genes and chromosomes. In the nucleus of eukaryotic cells, DNA molecules are very long, linear and associated with proteins, called histones. Together a DNA molecule and its associated proteins form a chromosome. A gene occupies a fixed position, called a locus, on a particular DNA molecule.


★ CIE Specification Reference: -  5 The mitotic cell cycle: describe the structure of a chromosome, limited to DNA, histone proteins, chromatids, centromere and telomeres.


★ Edexcel (Biology A – Salters-Nuffield) Specification Reference: - Topic 3: Voice of the Genome. 3.8 i) Know that a locus (plural = loci) is the location of genes on a chromosome. ii) Understand the linkage of genes on a chromosome.


★ Edexcel (Biology B) Specification Reference: - Topic 2: Cells, Viruses and Reproduction of Living Things; Topic 7: Modern Genetics; Topic 8: Origins of Genetic Variation.


★ OCR (Biology A) Specification Reference: -  Terminology is expected knowledge throughout. topics: -2.1 Foundations in biology; 2.1.6 Cell division, cell diversity and cellular organisation & Module 6 – Genetics, evolution and ecosystems).


★ OCR (Biology B) Specification Reference: - Terminology is expected knowledge throughout.: 3.1.1 The developing cell: cell division and cell differentiation; 3.1.2 The developing individual: meiosis, growth and development; 3.3.1 The cellular basis of cancer and treatment; Module 5: Genetics, control and homeostasis - e.g. To include the correct usage of the terms gene, allele (gene variant), locus, phenotype, genotype, dominant and recessive, heterozygous and homozygous and codominant.


★ WJEC Specification Reference: -Terminology is expected knowledge throughout: i.e. Core Concepts 5. Nucleic acids and their functions. CONTINUITY OF LIFE: 2. Genetic information is copied and passed on to daughter cells. 5. Inheritance: (a) alleles as different forms of the same gene. 7. Application of reproduction and genetics.

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