AQA A Level Biology复习笔记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复习笔记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复习笔记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复习笔记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复习笔记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复习笔记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复习笔记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复习笔记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复习笔记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...
