AQA A Level Biology复习笔记7.3.7 Types of Speciation
Allopatric & Sympatric Speciation Evolution causes speciation: the formation of new species from pre-existing species over time, as a result of changes to gene pools from generation to g...
AQA A Level Biology复习笔记7.3.6 Reproductive Separation
Reproductive Separation Reproductive separation In order for evolution to occur the new species population must be genetically and reproductively separated from the pre-existing species popu...
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 ...
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...
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...
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...
AQA A Level Biology复习笔记7.1.6 The Chi-squared Test
Predicting Inheritance: Chi-squared Test The difference between expected and observed results in experiments can be statistically significant or insignificant (happened by chance) If the dif...
