Cell Cycle and Mitosis. Follows the Pearson Edexcel International AS/A Level Specification. Learning outcome:
3.14 Understand the role of mitosis and the cell cycle in producing genetically identical daughter cells for growth and asexual reproduction.
3.15 Prepare and stain a root tip squash to observe the stages of mitosis.
3.16 Be able to calculate mitotic index.
Content:
All steps of the cell cycle, including: interphase, prophase, metaphase, anaphase, telophase and cytokinesis.
Mitotic Index.
Core practical 6.
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Topic 3 Edexcel International AS Level
Complete coverage of the Pearson Edexcel International AS/A Level Specifications topic 3. Learning outcome: 3.1 Know that all living organisms are made of cells, sharing some common features. 3.2 Understand how the cells of multicellular organisms are organised into tissues, tissues into organs and organs into organ systems. 3.3 (i & ii) Know and understand the function of the ultrastructure of eukaryotic cells, including nucleus, nucleolus, ribosomes, rough and smooth endoplasmic reticulum, mitochondria, centrioles, lysosomes and Golgi apparatus. 3.4 Understand the role of the rough endoplasmic reticulum (rER) and the Golgi apparatus in protein transport within cells, including their role in the formation of extracellular enzymes. 3.5 (i) & (ii) Know and understand the function of the ultrastructure of prokaryotic cells, including cell wall, capsule, plasmid, flagellum, pili, ribosomes and circular DNA. 3.6 Be able to recognise the organelles in 3.3 from electron microscope (EM) images. 3.7 (i) Know how magnification and resolution can be achieved using light and electron microscopy. 3.7 (ii) Understand the importance of staining specimens in microscopy **Core Practical 5: 3.8 (i) Use a light microscope to make observations and labeled drawings of suitable animal cells.** 3.9 (i) Know that a locus is the location of genes on a chromosome. 3.9 (ii) Understand the linkage of genes on a chromosome. 3.10 Understand the role of meiosis in ensuring genetic variation through the production of non-identical gametes as a consequence of independent assortment of chromosomes in metaphase 1 and crossing over of alleles between chromatids in prophase 1. 3.11 Understand how mammalian gametes are specialised for their functions (including the acrosome in sperm and the zona pellucida in the egg cell). 3.12 Know the process of fertilisation in mammals, including the acrosome reaction, the cortical reaction and the fusion of nuclei. 3.13 Know the process of fertilisation in flowering plants, starting with the growth of a pollen tube and ending with the fusion of nuclei. 3.14 Understand the role of mitosis and the cell cycle in producing genetically identical daughter cells for growth and asexual reproduction. **3.15 Prepare and stain a root tip squash to observe the stages of mitosis.** 3.16 Be able to calculate mitotic index. 3.17 (i) Understand what is meant by the terms stem cell, pluripotent and totipotent, morula and blastocyst. 3.17 (ii) be able to discuss the ways in which society uses scientific knowledge to make decisions about the use of stem cells in medical therapies. 3.18 Understand how cells become specialised through differential gene expression, producing active mRNA, leading to the synthesis of proteins which, in turn, control cell processes or determine cell structure in animals and plants. 3.19 Understand how one gene can give rise to more than one protein through post-transcriptional changes to messenger RNA (mRNA). 3.20 (i) Understand how phenotype is the result of an interaction between genotype and the environment. 3.20 (ii) Know how epigenetic modification, including DNA methylation and histone. modification, can alter the activation of certain genes. 3.20 (iii) Understand how epigenetic modifications can be passed on following cell division. 3.21 Understand how some phenotypes are affected by multiple alleles for the same gene, or by polygenic inheritance, as well as the environment, and how polygenic inheritance can give rise to phenotypes that show continuous variation. Content: Lesson 1: Observing Cells History of the microscope and cell theory Light microscope Sample staining Magnification and Resolution Drawing scientific diagrams Electron microscopes Advantages and disadvantages Lesson 2: Eukaryotic Cells Recap of GCSEs Cell organelles There functions What the look like under a microscope Protein transport Lesson 3: Prokaryotic Cells All ultrastructures and their functions Classifying bacteria (including gram staining, shape and oxygen needs) Lesson 4: Cell Organisation Types of tissues Types of epithelial cells Plant and human organs GCSE recall of organ systems and their functions Lesson 5: Cell Cycle and Mitosis. All steps of the cell cycle Mitotic Index Core practical 6 Lesson 6: Sexual Reproduction, Gametes Structure and Function, and Meiosis Importance of sexual reproduction on variation Gamete structure, function and location The steps of meiosis I & II Variation from recombination and independent assortment Lesson 7: Fertilisation in Plants and Animals Internal and external fertilisation Pollination Plant fertilisation Human fertilisation Lesson 8: Cell Differentiation: Gene Expression Cell Differentiation Effect of Multiple Alleles Co-dominance Dihybrid Inheritance Linked Genes. Lesson 9: Interaction Between Genes and the Environment: Environmental effects on Phenotype (Including enzyme activity) Operons Studying Variation in Humans. Lesson 10: Controlling Gene Expression: Transcription Factors RNA Splicing Epigenetics (Including DNA and Histone Methylation, and Histone Acetylation) Non-Coding RNA Lesson 11: Stem Cells and Using Stem Cells: Blastocyst Development Types of Stems Cells Where Stem Cells are collected Epigenetic Control of haemoglobin development Stem Cell Therapy (including Therapeutic Cloning and iPS Cells) Examples of potential treatable conditions Ethics
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Mitosis, Meiosis and Reproduction
Follows the Pearson Edexcel International AS/A Level Specification. Learning outcome: 3.10 Understand the role of meiosis in ensuring genetic variation through the production of non-identical gametes as a consequence of independent assortment of chromosomes in metaphase 1 and crossing over of alleles between chromatids in prophase 1. 3.11 Understand how mammalian gametes are specialised for their functions (including the acrosome in sperm and the zona pellucida in the egg cell). 3.12 Know the process of fertilisation in mammals, including the acrosome reaction, the cortical reaction and the fusion of nuclei. 3.13 Know the process of fertilisation in flowering plants, starting with the growth of a pollen tube and ending with the fusion of nuclei. 3.14 Understand the role of mitosis and the cell cycle in producing genetically identical daughter cells for growth and asexual reproduction. 3.15 Prepare and stain a root tip squash to observe the stages of mitosis. 3.16 Be able to calculate mitotic index. Content: Presentation 1: Cell Cycle and Mitosis. All steps of the cell cycle, including: interphase, prophase, metaphase, anaphase, telophase and cytokinesis. Mitotic Index. Core practical 6. Presentation 2: Sexual Reproduction, Gametes Structure and Function, and Meiosis. Importance of sexual reproduction on variation. Gamete structure, function and location. The steps of meiosis I & II. Variation from recombination and independent assortment. Presentation 3: Fertilisation in Plants and Animals. Internal and external fertilisation. Pollination. Plant fertilisation. Human fertilisation.
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