Inherited Disorders
Inherited disorders such as cystic fibrosis and sickle cell disease are caused by faulty alleles passed from parents to children.
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Inherited disorders such as cystic fibrosis and sickle cell disease are caused by faulty alleles passed from parents to children.
- Cystic fibrosis is caused by a recessive allele
- Carriers have one faulty allele
- Genetic screening can detect them
🧠 Quick quiz
Three questions. Score 2 or more to complete the topic.
What is Inherited Disorders?
Within Biology, which covers cells, the human body, genetics, evolution, plants and ecosystems: the science of living things, this topic explains Inherited Disorders. Biology topics show how living things work, from the cell up to whole ecosystems, with models you can explore step by step.
Check that you can explain Inherited Disorders in your own words and give one example from everyday life. If you can do that, you have understood the core idea.
Understanding Inherited Disorders helps you explain how living things stay alive and respond to their surroundings, which is central to biology exams.
Inherited Disorders in detail
Inherited disorders are caused by faulty alleles passed from parents. Cystic fibrosis is caused by a recessive allele, so a child must inherit two copies, and it causes thick mucus in the lungs and gut. Huntington's disease is caused by a dominant allele, so one copy is enough, and it affects the nervous system later in life.
Polydactyly (extra fingers) is another dominant condition. Carriers are people with one copy of a recessive allele who show no symptoms. Genetic screening and counselling inform families, and embryo screening raises ethical questions about its use. Genetic testing can detect alleles for conditions.
How the interactive helps you understand Inherited Disorders
Click a card to flip it and reveal the answer, then move on to the next one.
Before you change anything, predict the result. Then change one value at a time and check whether your prediction was right. This is a quick way to build a correct mental model of Inherited Disorders.
Real-life uses and examples
- Explain how Inherited Disorders helps a living thing stay alive, using a plant or animal example.
- Connect Inherited Disorders to health, food and medicine in everyday life.
- Use Inherited Disorders to interpret a diagram, graph or microscope image from a practical.
Common mistakes to avoid
- Using everyday words, such as “energy” or “bad”, without their scientific meaning.
- Listing the steps of a process without saying how one step causes the next.
- Learning the definition without testing it. Use the quiz and the interactive to check that you can apply the idea.
Frequently asked questions about Inherited Disorders
What is Inherited Disorders?
Inherited disorders such as cystic fibrosis and sickle cell disease are caused by faulty alleles passed from parents to children.
What are the most important points about Inherited Disorders?
The main points are: Cystic fibrosis is caused by a recessive allele; Carriers have one faulty allele; Genetic screening can detect them.
Why is Inherited Disorders useful?
Understanding Inherited Disorders helps you explain how living things stay alive and respond to their surroundings, which is central to biology exams.
How can I practise Inherited Disorders?
Open the interactive at the top of this page and change the controls one at a time. Predict the result before each change, then take the three-question quiz. A score of two or more marks the topic as complete on this device.
Which topics are related to Inherited Disorders?
Related topics in Biology include Mutations, Fossils and Evidence for Evolution, Genetic Engineering.