This key facts covers Genetic Testing and Ethical Issues within Inherited Disorders for GCSE Biology. Genetic disorders, family pedigrees, and probability calculations It is section 2 of 11 in this topic. Use this key facts to connect the idea to the wider topic before moving on to questions and flashcards.
Genetic Testing and Ethical Issues
- Screening: Testing embryos/parents for genetic disorders
- Benefits: Couples can make informed decisions; prepare for care needs
- Concerns: Could lead to discrimination; who decides what's "normal"?
- PGD: Pre-implantation genetic diagnosis — testing IVF embryos before implanting
Practice questions for Inherited Disorders
What is an inherited disorder?
Describe how genetic screening can be used to detect inherited disorders.
Quick recall flashcards
What is cystic fibrosis and how is it inherited?
Cystic fibrosis is a recessive disorder caused by having two copies of the faulty allele (ff). It causes thick, sticky mucus to build up in the lungs and digestive system, leading to breathing difficulties and frequent infections.
What is polydactyly and how is it inherited?
Polydactyly is a dominant disorder — having just ONE copy of the dominant allele (Pp or PP) causes extra fingers or toes. Only one affected parent is needed to pass it on. It is usually not harmful and can be corrected surgically.