Edexcel IGCSE Biology 復(fù)習(xí)筆記 3.2.7 Mutation
Edexcel IGCSE Biology 復(fù)習(xí)筆記 3.2.7 Mutation Mutations Mutations are?rare,?random changes?that occur in the?sequence of DNA bases?in a gene or a chromosome Mutations occur?continuously As t...
IB DP Maths: AA HL復(fù)習(xí)筆記2.2.4 Quadratic Inequalities
What affects the inequality sign when rearranging a quadratic inequality? The inequality sign is?unchanged?by... Adding/subtracting?a term to both sides Multiplying/dividing?both sides by a?positiv...
Edexcel IGCSE Biology 復(fù)習(xí)筆記 3.2.6 Variation
Edexcel IGCSE Biology 復(fù)習(xí)筆記 3.2.6 Variation Types of Variation Variation is defined as?differences between individuals of the same species Variation can be divided into two types dependin...
Edexcel IGCSE Biology 復(fù)習(xí)筆記 3.2.5 Cell Division
Edexcel IGCSE Biology 復(fù)習(xí)筆記 3.2.5 Cell Division Mitosis Mitosis is defined as?nuclear division giving rise to genetically identical cells This type of cell division is used for?growth, re...
IB DP Maths: AA HL復(fù)習(xí)筆記2.2.3 Solving Quadratics
Solving Quadratics Equations How do I decide the best method to solve a quadratic equation? If it is a calculator paper then use your GDC to solve the quadratic If it is a non-calculator paper then...
Edexcel IGCSE Biology 復(fù)習(xí)筆記 3.2.4 Predicting Genetic Inheritance
Edexcel IGCSE Biology 復(fù)習(xí)筆記 3.2.4 Predicting Genetic Inheritance Family Pedigrees Family pedigree diagrams are usually used to trace the?pattern of inheritance?of a specific characteristi...
Edexcel IGCSE Biology 復(fù)習(xí)筆記 3.2.3 Genetic Inheritance
Edexcel IGCSE Biology 復(fù)習(xí)筆記 3.2.3 Genetic Inheritance Key Definitions A?gene?is a short length of DNA found on a chromosome that codes for a particular?characteristic?(expressed by the fo...
Edexcel IGCSE Biology 復(fù)習(xí)筆記 3.2.2 Protein Synthesis
Edexcel IGCSE Biology 復(fù)習(xí)筆記 3.2.2 Protein Synthesis RNA Like DNA, the nucleic acid RNA (ribonucleic acid) is a?polynucleotide?– it is made up of many nucleotides linked together in a long...
IB DP Maths: AA HL復(fù)習(xí)筆記2.2.2 Factorising & Completing the Square
Why is factorising quadratics useful? Factorising gives?roots (zeroes or solutions)?of a quadratic It gives the?x-intercepts?when drawing the graph How do I factorise a monic quadratic of the form?...
Edexcel IGCSE Biology 復(fù)習(xí)筆記 3.2.1 DNA & the Genome
Edexcel IGCSE Biology 復(fù)習(xí)筆記 3.2.1 DNA & the Genome The Genome The?entire set of the genetic material?of an organism is known as its?genome In 2003, scientists completed a 13-year proj...
Edexcel IGCSE Biology 復(fù)習(xí)筆記 3.1.7 Human Sex Hormones
Edexcel IGCSE Biology 復(fù)習(xí)筆記 3.1.7 Human Sex Hormones Secondary Sexual Characteristics Primary sexual characteristics are present during development in the uterus and are the differences i...
Edexcel IGCSE Biology 復(fù)習(xí)筆記 3.1.6 Pregnancy
Edexcel IGCSE Biology 復(fù)習(xí)筆記 3.1.6 Pregnancy Implantation & Development of the Foetus After fertilisation in the?oviduct, the zygote travels towards the?uterus This usually takes about...
