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  • IGCSE Biology - 3b Inheritance - Genetics

IGCSE Biology - 3b Inheritance - Genetics

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New Edexcel IGCSE 9-1 4BI1 syllabus for 2017 first examined in 2019


Section 3b Inheritance - Genetics


  • 3.19 understand how genes exist in alternative forms called alleles which give rise to differences in inherited characteristics
  • 3.20 understand the meaning of the terms: dominant, recessive, homozygous, heterozygous, phenotype, and genotype
  • 3.21B understand the meaning of the term codominance
  • 3.22 understand that most phenotypic features are the result of polygenic inheritance rather than single genes
  • 3.23 describe patterns of monohybrid inheritance using a genetic diagram
  • 3.24 understand how to interpret family pedigrees
  • 3.25 predict probabilities of outcomes from monohybrid crosses
  • 3.26 understand how the sex of a person is controlled by one pair of chromosomes, XX in a female and XY in a male
  • 3.27 describe the determination of the sex of offspring at fertilisation, using a genetic diagram


New and updated resource for IGCSE 9-1- More practical pages, updated design, concept checker and exam style question for each topic.

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  • Home
  • Revision Courses
  • GCSE (9-1)
    • Topic 8
    • Topic 9
  • IGCSE (9-1)
    • 1 The nature and variety of living organisms
    • 2 Structures and functions in living organisms
    • 3 Reproduction and inheritance
    • 4 Ecology and the environment
    • 5 Uses of biological resources
    • IGCSE Revision Resources
  • Pre-U
    • 1 The Cell
    • 2 The Origin and Evolution of Life
    • 4 The Life of Plants
  • A Level
  • IB
  • Tutoring
  • Blog
  • Book me!