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)

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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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