GCSE Biology - Inherited Disorders | Polydactyly | Cystic Fibrsosis

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*** WHAT'S COVERED ***
1. Inherited Disorders
* Definition as conditions passed on via alleles from parents.
2. Polydactyly
* Condition resulting in extra fingers or toes.
* Caused by a dominant allele.
* Explanation of inheritance using a genetic diagram (heterozygous x homozygous recessive cross).
* Calculating probability of inheritance.
3. Cystic Fibrosis
* Disorder of cell membranes causing thick, sticky mucus.
* Affects lungs and pancreas primarily.
* Caused by a recessive allele.
* Explanation of carriers (heterozygous individuals).
* Explanation of inheritance using a genetic diagram (heterozygous x heterozygous cross).
* Calculating probability of inheritance.
4. Embryo Screening
* Process linked with In Vitro Fertilisation (IVF).
* Screening embryos for genetic disorders before implantation.
* Discussion of the advantages (reducing suffering, cost savings).
* Discussion of the ethical concerns and disadvantages (potential prejudice, 'designer babies').

*** CHAPTERS ***
0:00 Intro
0:22 Polydactyly (Dominant Disorder)
0:46 Polydactyly Inheritance Example
1:40 Cystic Fibrosis (Recessive Disorder)
2:17 Cystic Fibrosis Carriers
2:41 Cystic Fibrosis Inheritance Example
3:32 Embryo Screening and IVF
4:30 Pros and Cons of Embryo Screening

*** PLAYLISTS ***






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