Cambridge IGCSE Biology
17.4Monohybrid inheritance
Monohybrid inheritance in Cambridge IGCSE Biology: what the syllabus expects you to know, the learning objectives and how to practise.
Subtopic78 practice questions3 lessons
Overview
Test crosses, codominance and sex linkage are Supplement.
Learning objectives
What the syllabus expects you to be able to do.
- 17.4.1Describe inheritance, genotype, phenotype, homozygous, heterozygous, pure-breeding, dominant allele and recessive allele.
- 17.4.2Interpret pedigree diagrams for the inheritance of a characteristic.
- 17.4.3Use genetic diagrams and Punnett squares to predict the results of monohybrid crosses and calculate 1 : 1 and 3 : 1 phenotypic ratios.
- 17.4.4Supplement: explain how a test cross identifies an unknown genotype.
- 17.4.5Supplement: describe codominance and explain the inheritance of the ABO blood groups.
- 17.4.6Supplement: describe sex linkage, using red-green colour blindness as an example, and use genetic diagrams for crosses involving codominance or sex linkage.
Lessons
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Codominance and the ABO blood groups
16 min
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Monohybrid inheritance
20 min
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Sex linkage
16 min
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Sample question
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