This diagram covers Visual: Inherited Disorders within Inherited Disorders for GCSE Biology. Genetic disorders, family pedigrees, and probability calculations It is section 3 of 11 in this topic. Focus on the labels, the relationships between parts, and the explanation that turns the diagram into an exam-ready answer.
Visual: Inherited Disorders
Remember: Cystic fibrosis = RECESSIVE (ff) — both parents must be carriers | Polydactyly = DOMINANT (P) — only one allele needed
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 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.
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.