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...
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...
AQA A Level Biology复习笔记7.1.2 Predicting Inheritance: Monohybrid Crosses
Monohybrid Crosses Monohybrid inheritance looks at how the alleles for a single gene are passed on from one generation to the next Known information about the genotypes, phenotypes and the p...
AQA A Level Biology复习笔记6.4.11 Control of Blood Water Potential
Osmoregulation The control of the water potential of body fluids is known as osmoregulation Osmoregulation is a key part of homeostasis Specialised sensory neurones, known as osmoreceptors, ...
AQA A Level Biology复习笔记6.4.10 The Function of the Nephron
Ultrafiltration The nephron is the functional unit of the kidney – the nephrons are responsible for the formation of urine The process of urine formation in the kidneys occurs in two stages:...
AQA A Level Biology复习笔记6.4.9 The Structure of the Nephron
Structure of the Kidney and the Nephron Humans have two kidneys The kidneys are responsible for carrying out two very important functions: As an osmoregulatory organ - they regulate the wate...
AQA A Level Biology复习笔记6.4.8 Calculating the Concentration of Glucose in Urine
Required Practical: Producing a Dilution Series and Calibration Curve An alternative version of Benedict’s solution can be used to carry out a quantitative test on an unknown urine sample to...
