AQA A Level Biology复习笔记7.3.5 Evolution
Evolution The allele frequencies (within the gene pool) of a population can change over time due to processes such as natural selection When the allele frequencies of a population change suf...
AQA A Level Biology复习笔记7.3.4 Types of Selection
Types of Selection & Their Effects Environmental factors that affect the chance of survival of an organism are referred to as selection pressures For example, there could be high levels ...
Edexcel IGCSE Biology 复习笔记 2.6.1 Energy
Edexcel IGCSE Biology 复习笔记 2.6.1 Energy ATP Organisms need energy for things such as: Chemical reactions to build larger molecules from smaller molecules Muscle contraction to allow move...
AQA A Level Biology复习笔记7.3.3 Selective Advantage
Selective Advantage Every individual within a species population has the potential to reproduce and have offspring In reality, however, there are many environmental factors that prevent ever...
AQA A Level Biology复习笔记7.3.2 Natural Selection
Natural Selection Every individual within a species population has the potential to reproduce and have offspring which contribute to population growth If all the offspring of every individua...
Edexcel IGCSE Biology 复习笔记 2.5.12 The Energy Content of Food
Edexcel IGCSE Biology 复习笔记 2.5.12 The Energy Content of Food Practical: Energy Content of a Food Sample We can investigate the energy content of food in a simple calorimetry experiment A...
Edexcel IGCSE Biology 复习笔记 2.5.11 Absorption
Edexcel IGCSE Biology 复习笔记 2.5.11 Absorption Absorption of Food & Water The Stages of Food Breakdown Food taken into the body goes through several different stages during its ...
Edexcel IGCSE Biology 复习笔记 2.5.10 Humans: Bile
Edexcel IGCSE Biology 复习笔记 2.5.10 Humans: Bile Bile Production Bile is an alkaline substance produced by cells in the liver Before being released into the small intestine bile is stored ...
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AQA A Level Biology复习笔记7.2.3 Hardy-Weinberg
Natural Selection: Hardy-Weinberg Principle The Hardy-Weinberg principle states that if certain conditions are met then the allele frequencies of a gene within a population will not change f...
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AQA A Level Biology复习笔记7.2.2 Gene Pools & Allele Frequency
Gene Pools & Allele Frequency Gene pools The phenotype of an organism is dependent on its genotype and the environmental influence on the organism Members of the same species will have t...
