Edexcel IGCSE Maths 復習筆記 4.10.1 Sine & Cosine Rules, Area of a Triangle - Basics What are the sine & cosine rules, & the area of a triangle formula? Remember,?Pythagoras?and?SOHCAHT...
The Theory of Natural Selection Genetic variation?exists within populations due to the presence of different alleles There is?differential?reproductive success?between the organisms with dif...
Maths Skill: Using Logarithms When Investigating Bacteria Bacterial colonies can grow at rapid rates when in culture with very large numbers of bacteria produced within hours Dealing with th...
Understanding the Outcomes & Processes in Mitosis & Meiosis Mitosis and meiosis are both forms of cell division They have many similarities and differences that are important for the...
Apparatus & Techniques: Using an Optical Microscope Many biological structures are too small to be seen by the naked eye Optical microscopes are an invaluable tool for scientists as they...
Meiosis: Sources of Genetic Variation Having?genetically different offspring?can be?advantageous?for natural selection Meiosis?has several mechanisms that?increase the genetic diversity of g...
Meiosis in Animal & Plant Cells Meiosis is a form of?nuclear division?that results in the?production of?haploid?cells?from diploid cells It produces?gametes?in plants and animals that ar...
Meiosis Meiosis produces?daughter cells that are genetically different?from each other and to the parent cell This is due to the processes of independent assortment and crossing over Indepen...
Mutations in Chromosome Number Mutations can occur at different levels Non-disjunction?occurs when chromosomes fail to separate during?meiosis This occurs?spontaneously The gametes ma...
Relating Nucleic Acid & Amino Acid Sequences A?triplet?is a sequence of three DNA bases that codes for a specific amino acid A?codon?is a sequence of three?mRNA?bases that codes for a sp...
Translation A?gene?is a?sequence of nucleotide bases?in a DNA molecule that?codes for the production of a specific sequence of amino acids, that in turn make up a?specific polypeptide?(prote...
Eukaryotic Transcription The genome within eukaryotic cells contains many non-coding sections Non-coding DNA can be found: Between genes, as?non-coding multiple repeats Within genes, as?intr...
