AQA A Level Biology復習筆記4.4.5 Environmental Adaption
Adapting to the Environment Environmental factors that affect the chance of survival of an organism are?selection pressures For example, there could be high competition for food between lion...
AQA A Level Biology復習筆記4.4.4 Directional & Stabilising Selection
Directional & Stabilising Selection Environmental factors that affect the chance of survival of an organism are?selection pressures For example, there could be high competition for food ...
Edexcel IGCSE Maths 復習筆記 4.10.1 Sine & Cosine Rules, Area of a Triangle - Basics
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...
AQA A Level Biology復習筆記4.4.3 Natural Selection
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...
AQA A Level Biology復習筆記4.4.2 Maths Skill: Using Logarithms When Investigating Bacteria
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...
AQA A Level Biology復習筆記4.3.7 The Outcomes & Processes of Mitosis & Meiosis
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...
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...
