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🎓 IGCSE Biology - The Complete Course: https://www.tes.com/teaching-resource/resource-12989155 IGCSE Chemistry - The Complete Course: 🎓 Complete Teaching Resource (including past exam questions and mark schemes organised by chapter): https://www.tes.com/teaching-resource/resource-13280954 🎓 Student resource (PDF only): https://www.tes.com/teaching-resource/resource-13245244 🎓 All the videos (the complete library on Patreon): https://www.patreon.com/igbiocomplete ☕️ Buy me a coffee - https://www.buymeacoffee.com/ArthurJohnParker Cambridge IGCSE Biology (0610/0970) Chapter 17 - Inheritance Topic 17.4 - Monohybrid inheritance For exams from 2025 (core and extended) As always this video follows the Cambridge syllabus exactly and contains absolutely everything you need to know for your final exam! My other channels: @igpecomplete - Cambridge IGCSE PE @ocrpecomplete - OCR GCSE PE Timestamps: 0:00 Contents 0:56 Inheritance 1:36 Genotype and phenotype 1:54 Dominant and recessive alleles 2:38 Homozygous and heterozygous 3:21 Genetic diagrams 4:11 Punnett squares 5:17 Pedigree diagrams 6:22 Test crosses (extended) 7:10 Codominance and blood groups (extended) 8:14 Sex linkage Core content: - Describe inheritance as the transmission of genetic information from generation to generation. - Describe genotype as the genetic make-up of an organism and in terms of the alleles present. - Describe phenotype as the observable features of an organism. - Describe homozygous as having two identical alleles of a particular gene. - State that two identical homozygous individuals that breed together will be pure-breeding. - Describe heterozygous as having two different alleles of a particular gene. - State that a heterozygous individual will not be pure-breeding. - Describe a dominant allele as an allele that is expressed if it is present in the genotype. - Describe a recessive allele as an allele that is only expressed when there is no dominant allele of the gene present in the genotype. - Interpret pedigree diagrams for the inheritance of a given characteristic. - Use genetic diagrams to predict the results of monohybrid crosses and calculate phenotypic ratios, limited to 1 : 1 and 3 : 1 ratios. - Use Punnett squares in crosses which result in more than one genotype to work out and show the possible different genotypes. Extended content: - Explain how to use a test cross to identify an unknown genotype. - Describe codominance as a situation in which both alleles in heterozygous organisms contribute to the phenotype. - Explain the inheritance of ABO blood groups: phenotypes are A, B, AB and O blood groups and alleles are IA, IB and Io. - Describe a sex-linked characteristic as a feature in which the gene responsible is located on a sex chromosome and that this makes the characteristic more common in one sex than in the other. - Describe red-green colour blindness as an example of sex linkage - Use genetic diagrams to predict the results of monohybrid crosses involving codominance or sex linkage and calculate phenotypic ratios.