IGCSE Biology - Monohybrid inheritance (17.4)

Cambridge IGCSE Biology (0610/0970)
Chapter 17 - Inheritance
Topic 17.4 - Monohybrid inheritance
For exams in 2023, 2024 & 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!

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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.

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[theigcsehub]

Hi, I am facing a issue I am from Pakistan and 1 video is unavailable for me, I can only see 3 video and it says 1 is unavailable?

[AHidris..]

6:05 males can be carriers to diseases ???? Because I thought that males can be either affected or unaffected due to the lack of a corresponding allele in the Y chromosome....