Edexcel IGCSE Biology 3.19 Alleles Topic Practice

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Pearson Edexcel International GCSE Biology

1 The nature and variety of living organisms

(a) Characteristics of living organisms

(b) Variety of living organisms

2 Structure and functions in living organisms

(a) Level of organisation

(b) Cell structure

(c) Biological molecules

(d) Movement of substances into and out of cells

(f) Respiration

(g) Gas exchange

(j) Co-ordination and response

3 Reproduction and inheritance

(a) Reproduction

(b) Inheritance

3.14 Genome and genes

3.15 Chromosomes and genes

3.16B Codons and amino acids

3.17B Protein synthesis

3.18B Genes, proteins and phenotype

3.20 Genetic terminology

3.21B Polygenic inheritance

3.22 Polygenic inheritance

3.23 Monohybrid inheritance

3.24 To interpret family pedigrees

3.25 Monohybrid inheritance

3.26 Sex chromosomes

3.27 Sex determination at fertilisation

3.30 Natural selection

3.31 Random fertilisation and variation

3.32 In human cells the diploid number of chromosomes

3.33 Variation within a species

3.35B Speciation

3.36B Evidence for human evolution

3.37B Darwin’s theory and Wallace

3.38 Darwin’s theory of evolution by natural selection

3.39 Antibiotic resistance

4 Ecology and the environment

(a) The organism in the environment

(b) Feeding relationships

(c) Cycles within ecosystems

(d) Human influences on the environment

5 Use of biological resources

(a) Food production

(b) Selective breeding

(c) Genetic modification (genetic engineering)

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