Inheritance & EvolutionDiagram

Visual: Inherited Disorders

Part of Inherited Disorders · GCSE GCSE Biology revision

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.

Topic position

Section 3 of 11

Practice

23 questions

Recall

12 flashcards

Visual: Inherited Disorders

Painted comparison of two inherited disorders: LEFT cystic fibrosis (recessive pattern: two carrier parents with Cc genotype, offspring 1:2:1 ratio); RIGHT Huntington's disease (dominant pattern: one affected parent with Hh, offspring 1:1 affected vs unaffected). Family pedigree symbols painted as warm squares/circles.

Remember: Cystic fibrosis = RECESSIVE (ff) — both parents must be carriers | Polydactyly = DOMINANT (P) — only one allele needed

Keep building this topic

Read this section alongside the surrounding pages in Inherited Disorders. That gives you the full topic sequence instead of a single isolated revision point.

Genetic Testing and Ethical Issues How It Works: Inheriting CF and Polydactyly Two Inherited Disorders for AQA Reading Family Trees (Pedigree Diagrams)

Practice Questions for Inherited Disorders

What is an inherited disorder?

A. A disease caused by faulty genes passed from parents to offspring
B. A disease caught from other people
C. A disease caused by poor diet
D. A disease caused by aging

1 markfoundation

Describe how genetic screening can be used to detect inherited disorders.

4 marksstandard

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.

23 questions on Inherited Disorders — practise free

Instant marking, adaptive difficulty, and 12 spaced repetition flashcards. Free until your GCSEs.

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Genetic Testing and Ethical Issues

How It Works: Inheriting CF and Polydactyly