[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-detail-208070-en":3,"doc-seo-208070-105":30,"detail-sidebar-cat-0-en-105":90},{"code":4,"msg":5,"data":6},0,"success",{"doc_id":7,"user_id":8,"nickname":9,"user_avatar":10,"doc_module":4,"category_id":11,"category_name":12,"doc_title":13,"doc_description":14,"doc_content":15,"file_id":16,"file_url":17,"file_type":18,"file_size":19,"view_count":4,"is_deleted":4,"is_public":20,"is_downloadable":20,"audit_status":20,"page_count":21,"language":22,"language_code":23,"site_id":24,"html_lang":23,"table_of_contents":25,"faqs":26,"seo_title":27,"seo_description":14,"update_tm":28,"read_time":29},208070,549768064778,"Felix Montgomery","https://ap-avatar.wpscdn.com/davatar_6f874abed73319feea01a86fa6f0fab8",4,"Exam","Edexcel Biology GCSE - Topic 2: Cells and Control - Detailed Notes","Edexcel Biology GCSE Topic 2 notes explain chromosomes and how genetic information is carried as DNA in chromosomes. The cell cycle is broken down into interphase, mitosis and cytokinesis, including key events and outcomes such as DNA replication, chromosome alignment and separation. The document links mitosis to growth, asexual reproduction, and replacement of damaged cells, then covers differentiation, specialised cells, and how cancer arises from uncontrolled cell division. Plant growth via elongation and auxins, plus percentile-based monitoring, are also addressed.","Edexcel Biology GCSE  \n# Topic 2: Cells and ControlNotes\n\n(Content in bold is for higher tier only)  \n2.1 - Mitosis  \n2.2 - Importance of Mitosis  \n2.3 - Products formed by Mitosis  \n2.4 and 2.5 - Growth and Cancer  \n2.6 - Cell Differentiation and Specialised Cells  \n2.7 - Monitoring Growth using Percentiles  \n2.8 - Stem Cells in Embryos, Animals and Plants  \n2.9 - Benefits and Risks of Stem Cell use in Medicine  \n2.10B - **Biology Only** Structure and Function of the Brain  \n2.11B - ** Higher and Biology Only** CT and PET Scanning  \n2.12B - ** Higher and Biology Only** Treating Brain Injury  \n2.13 - Structure and Function of the Nervous System  \n2.14 - The Reflex Arc  \n2.15 - **Biology Only** Structure and Function of the Eye  \n2.16 and 2.17- **Biology Only** Defects of the Eye and their Treatment  \n## 2.1, 2.2, 2.3 - Mitosis and its Importance\n\nChromosomes  \nThe nucleus contains your genetic information.  \n● This is found in the form of chromosomes, which contain coils of DNA.  \n● A gene is a short section of DNA that codes for a protein and as a result controls acharacteristic- therefore each chromosome carries many genes.  \n● There are 23 pairs of chromosomes in each cell of the body, as you inherit one fromyour mother and one from your father - resulting in 46 chromosomes in total ineach cell.  \n● Sex cells (gametes) are the exception: there are half the number of chromosomes,resulting in 23 chromosomes in total in each gamete cell.  \n● A diploid number of chromosomes isthe amount found in body cells (46 in humans)  \n● A haploid number of chromosomes is half this amount (23 in humans), and is foundin gametes (sperm and egg cells), which combine to form the diploid amount.  \n## Mitosis and the Cell Cycle\n\nThe cell cycle is a series of steps that the cell has to undergo in order to divide.Mitosis is a step in this cycle - the stage when the cell divides.  \nStage 1 (  Interphase): In this stage the cell grows, organelles (such as ribosome andmitochondria) grow and increase in number, the synthesis of proteins occurs, DNA isreplicated (forming the characteristic ‘X’ shape) and energy stores are increased  \nStage 2 (  Mitosis): The chromosomes line up atthe equator of the cell and cell fibres pulleach chromosome of the ‘X’ to either side of the cell.  \nStage 3 (Cytokinesis): Two identical daughter cells form when the cytoplasm and cellmembranes divide  \nSummary of the cell cycle in detail:  \n\n| Cell cycleStages   | Event   | Outcome or chromosomal behaviour   |\n| --- | --- | --- |\n| Interphase   | | ● DNA replication occurs.  \u003Cbr>● The cell continues to grow.   |\n| Prophase   | | ● Chromosomes condense andbecome visible.  \u003Cbr>● The nuclear envelope breaksdown.  \u003Cbr>● The spindle fibres begin to form.   |\n| Metaphase   | | ● Chromosomes line up atthemetaphase plate along the equatorof the cell.   |\n| Anaphase   | | ● Pairs of sister chromatids areseparated.  \u003Cbr>● Spindle fibres contract.  \u003Cbr>● Sister chromatids are pulled to theopposite poles.   |\n\n\n| Telophase &Cytokinesis   | | Telophase:  \u003Cbr>● Chromosomes arrive at oppositepoles.  \u003Cbr>● Nuclear envelopes start to formaround each set of chromosomes.  \u003Cbr>● The spindle fibres breakdown.  \u003Cbr>Cytokinesis:  \u003Cbr>● The cytoplasm divides.  \u003Cbr>● By the end of this stage, two  \u003Cbr>genetically identical daughtercells are formed.   |\n| --- | --- | --- |\n\nCell division by mitosis in multicellular organisms is important in their growth anddevelopment, and when replacing damaged cells. Mitosis is also a vital part of asexualreproduction , as this typeof reproduction only involves one organism, so to produceoffspring it simply replicatesits own cells.  \nMitosis produces 2 daughter cells, each with identical sets of chromosomes to the parentcell.  \nBecause the sets of chromosomes in the daughter cell’s nucleus are the same as in theparent cell’s nucleus, mitosis produces 2 genetically identical diploid daughter cells.  \n## 2.4, 2.5 and 2.6 - Growth, Differentiation and Cancer\n\nIn animal","cbCaipAxDSzyqHeU","https://ap.wps.com/l/cbCaipAxDSzyqHeU","pdf",3796176,1,12,"English","en",105,"# 2.1, 2.2, 2.3 - Mitosis and its Importance\n## Chromosomes\n## Mitosis and the Cell Cycle\n# 2.4, 2.5 and 2.6 - Growth, Differentiation and Cancer\n## Growth and differentiation in animals\n## Growth in plants and elongation\n## Cancer and tumour formation\n# 2.7 - Monitoring Growth using Percentiles","[{\"question\":\"What is the difference between diploid and haploid chromosome numbers?\",\"answer\":\"Diploid chromosomes are the number found in body cells (46 in humans), while haploid chromosomes are half that amount (23 in humans) found in gametes. Gametes combine to restore the diploid number.\"},{\"question\":\"How do interphase, mitosis and cytokinesis contribute to cell division?\",\"answer\":\"During interphase the cell grows and replicates DNA. In mitosis chromosomes align and are separated, then cytokinesis divides the cytoplasm to produce two genetically identical daughter cells.\"},{\"question\":\"How does cancer develop according to these notes?\",\"answer\":\"Cancer results from small changes in cells that cause uncontrolled cell division. The resulting mass of cells is called a tumour.\"}]","Edexcel Biology GCSE - Topic 2: Cells and Control - Detailed Notes | PDF",1788602336,30,{"code":4,"msg":31,"data":32},"ok",{"site_id":24,"language":23,"slug":33,"title":13,"keywords":34,"description":14,"schema_data":35,"social_meta":85,"head_meta":87,"extra_data":89,"updated_unix":28},"edexcel-biology-gcse-topic-2-cells-and-control-detailed-notes","",{"@graph":36,"@context":84},[37,53,67],{"@type":38,"itemListElement":39},"BreadcrumbList",[40,44,48,51],{"item":41,"name":42,"@type":43,"position":20},"https://docshare.wps.com","Home","ListItem",{"item":45,"name":46,"@type":43,"position":47},"https://docshare.wps.com/document/","Document",2,{"item":49,"name":12,"@type":43,"position":50},"https://docshare.wps.com/document/exam/",3,{"item":52,"name":13,"@type":43,"position":11},"https://docshare.wps.com/document/edexcel-biology-gcse-topic-2-cells-and-control-detailed-notes/208070/",{"url":52,"name":13,"@type":54,"author":55,"headline":13,"publisher":57,"fileFormat":60,"inLanguage":23,"description":14,"dateModified":61,"datePublished":61,"encodingFormat":60,"isAccessibleForFree":62,"interactionStatistic":63},"DigitalDocument",{"name":9,"@type":56},"Person",{"url":41,"name":58,"@type":59},"DocShare","Organization","application/pdf","2026-09-05",true,{"@type":64,"interactionType":65,"userInteractionCount":4},"InteractionCounter",{"@type":66},"ViewAction",{"@type":68,"mainEntity":69},"FAQPage",[70,76,80],{"name":71,"@type":72,"acceptedAnswer":73},"What is the difference between diploid and haploid chromosome numbers?","Question",{"text":74,"@type":75},"Diploid chromosomes are the number found in body cells (46 in humans), while haploid chromosomes are half that amount (23 in humans) found in gametes. Gametes combine to restore the diploid number.","Answer",{"name":77,"@type":72,"acceptedAnswer":78},"How do interphase, mitosis and cytokinesis contribute to cell division?",{"text":79,"@type":75},"During interphase the cell grows and replicates DNA. In mitosis chromosomes align and are separated, then cytokinesis divides the cytoplasm to produce two genetically identical daughter cells.",{"name":81,"@type":72,"acceptedAnswer":82},"How does cancer develop according to these notes?",{"text":83,"@type":75},"Cancer results from small changes in cells that cause uncontrolled cell division. 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