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Summary AQA AS-level/A-level Periodicity revision notes

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Notes on Periodicity for AQA AS/A-level Chemistry | instant download | Struggling to memorise Periodicity? These beautifully handwritten A-Level AQA Chemistry notes make the trickiest topics easier to understand and revise. Ideal for visual learners, these notes are neat, structured, and directly aligned with the AQA specification. Summarised information meaning concise knowledge. - Handwritten for clarity and visual learning - Covers the full ‘Periodicity’ topic concisely - Perfect for quick revision or in-depth study - Digital PDF download – print or view on any device and instant access - uses exam question answers to learn key knowledge for subtopics Whether you're reviewing for mocks or prepping for your A-Level exams, these notes save you time and help lock in with easy-to-read visuals, definitions, and exam-style answer notes. Knowledge for many of the subtopics are in the form of answers to key exam questions so ticks important points when used to answer questions. No refunds as this is an electronic product but can contact if there are any issues with the product. Product should not be re-distributed or re-sold. Apologies for any tiny spelling mistakes as these have been handwritten on a device Trusted by students aiming for top grades– a must-have study tool for any serious A-Level student. Designed by an A-Level student (who got into Imperial for Medicine), for A-Level students – perfect for Year 12 & 13 revision! Good luck!

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Genetics populations evolution and ecosystems
Genotype
genetic constitution make up of an organism
determines the limits within which characteristicsmay vary
Phenotype
appearancecharacteristicdue tointeractionsbetweengenotype environmen
Gene
a lengthof DNAthatcodes for the sequence ofaminoacids of a polypeptide
Allele
one of the different formsof a gene
Locus
position of a gene on a DNA molecule
Homologouschromosomes
chromoses occur in pairs in diploidorganisms calledhomologouschromosome
onechromose from each parent
2 loci each carry one allele of a gene
Homozygous
allele on each of thechromosomes is the same
Heterozygous
Salles on each of the twochromosomes is different
Dominant allele
alwaysexpressed in phenotype
Recessive allele
onlyexpressed in phenotype when homozygous12alles present
codominance
both alleles are expressedin phenotype
sex linked gene
gene located on one sex chromosome X or Y




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