AQA A Level Biology復習筆記7.3.1 Genetic Variation
Genetic Variation Phenotype variation The observable characteristics of an organism are its phenotype Phenotypic variation is the?difference in phenotypes?between organisms of the same?speci...
Edexcel IGCSE Maths復習筆記 1.7.2 Percentage Increases & Decreases
Edexcel IGCSE Maths復習筆記 1.7.2 Percentage Increases & Decreases How do I increase or decrease by a percentage? Identify “before” & “after” quantities Find percentage of “before” that we ...
AQA A Level Biology復習筆記7.2.1 Populations
Species Exist in Populations A?species?can be defined as a group of?similar organisms?that can?reproduce?to give?fertile offspring Organisms of the same species have the?same number of chromosomes?...
AQA A Level Biology復習筆記7.1.1 Key Terms in Genetics
Key Terms in Genetics Genes & alleles The DNA contained within chromosomes is essential for cell survival Every?chromosome?consists of a long DNA molecule which?codes for several differe...
AQA A Level Biology復習筆記6.4.1 Principles of Homeostasis
Homeostasis In order to?function?properly and?efficiently, organisms have different?control systems?that ensure their?internal conditions?are kept relatively?constant Physiological control systems ...
Edexcel IGCSE Maths 復習筆記 1.7.1 Basic Percentages
Edexcel IGCSE Maths復習筆記 1.7.1 Basic Percentages What is a percentage? “Per-cent” simply means “ ÷ 100” (or “out of 100”) You can think of a percentage as a standardised way of expressing a frac...
AQA A Level Biology復習筆記6.3.1 Muscle Pairs
Muscle Pairs The?effective movement?of the human body requires both?muscle?and an?incompressible skeleton This is because muscles will only produce effective movement if they?pull on a structure?th...
AQA A Level Biology復習筆記6.2.1 Neurones
Myelinated Motor Neurones Information is sent through the nervous system as?nerve impulses?– electrical signals that pass along nerve cells known as?neurones A bundle of neurones is known as a nerv...
AQA A Level Biology復習筆記6.1.1 Survival & Response
Responding to Change Aids Survival Organisms must respond to changes in their environment in order to survive They can only survive if they are successful at: Finding favourable conditions for livi...
