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...
AQA A Level Biology复习笔记7.1.5 Investigating Genetic Ratios
Apparatus & Techniques: Investigating Genetic Ratios Known information about genotypes, phenotypes and the process of meiosis can be used to make predictions about the phenotypes of offs...
AQA A Level Biology复习笔记7.1.4 Predicting Inheritance: Test Crosses
Predicting Inheritance: Test Crosses A test cross can be used to deduce the genotype of an unknown individual that is expressing a dominant phenotype The individual in question is crossed wi...
AQA A Level Biology复习笔记7.1.3 Predicting Inheritance: Dihybrid Crosses
Dihybrid Crosses Monohybrid crosses look at how the alleles of one gene transfer across generations Dihybrid crosses look at how the alleles of two genes transfer across generations The gene...
