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 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 RNA Like DNA, the nucleic acid RNA (ribonucleic acid) is a?polynucleotide?– it is made up of many nucleotides linked together in a long...
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 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 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 Implantation & Development of the Foetus After fertilisation in the?oviduct, the zygote travels towards the?uterus This usually takes about...
Edexcel IGCSE Biology 復(fù)習(xí)筆記 3.1.5 Sexual Reproduction in Humans The Male Reproductive System The male reproductive system Male Reproductive Structures & th...
Quadratic Functions & Graphs What are the key features of quadratic graphs? The value of?a?affects the shape of the curve If?a?is?positive?the shape is?concave up?∪ If?a?is?negative?the shape i...
Edexcel IGCSE Biology 復(fù)習(xí)筆記 3.1.4 Asexual Reproduction in Plants Asexual Reproduction in Plants Plants can reproduce?asexually?as well as?sexually Asexual reproduction only?involves?one p...
Edexcel IGCSE Biology 復(fù)習(xí)筆記 3.1.3 Practical: Conditions for Germination Practical: Conditions for Germination Germination?is the?start of growth in the seed Three factors are required for...
Equations of a Straight Line How do I find the gradient of a straight line? Find two points that the line passes through with coordinates (x1, y1) and?(x2, y2) The gradient between these two points...
