AQA A Level Biology復習筆記4.3.6 Meiosis Under a Microscope
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...
AQA A Level Biology復習筆記4.3.5 Meiosis: Sources of Genetic Variation
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...
AQA A Level Biology復習筆記4.3.4 Meiosis in Animal & Plant cells
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...
AQA A Level Biology復習筆記4.3.3 Meiosis
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...
AQA A Level Biology復習筆記4.3.2 Mutations in Chromosome Number
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...
AQA A Level Biology復習筆記4.2.6 Nucleic Acid & Amino Acid Sequence Comparison
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...
AQA A Level Biology復習筆記4.2.5 Translation
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...
AQA A Level Biology復習筆記4.2.4 Eukaryotic Transcription
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...
AQA A Level Biology復習筆記4.2.3 Transcription
Transcription 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?(pro...
AQA A Level Biology復習筆記4.2.2 The Structure of RNA
The Structure of mRNA and tRNA Like DNA, the nucleic acid RNA (ribonucleic acid) is a?polynucleotide?– it is made up of?many nucleotides?linked together in a?long chain Like DNA, RNA nucleot...
Edexcel IGCSE Maths 復習筆記 4.9.2 3D Pythagoras & SOHCAHTOA
Edexcel IGCSE Maths 復習筆記 4.9.2 3D Pythagoras & SOHCAHTOA What are Pythagoras & SOHCAHTOA? Pythagoras’ Theorem?helps us find missing side lengths of a right-angled triangle It is also fr...
Edexcel IGCSE Maths 復習筆記 4.9.1 SOHCAHTOA
Edexcel IGCSE Maths 復習筆記 4.9.1 SOHCAHTOA What is SOHCAHTOA? SOHCAHTOA is a mnemonic – ie a way to remember the 3 important formulas for sin (sine), cos (cosine), and tan (tangent) In a right-an...
