Biology Topic Practice
Inherited Disorders
Some disorders are caused by the inheritance of certain alleles from parents.
Is polydactyly dominant or recessive?
What is Inherited Disorders?
"Inherited disorders are health conditions caused by faulty alleles that are passed from parents to their children."
Question 1
Polydactyly is caused by which type of allele?
Question 2
Cystic fibrosis is caused by which type of allele?
Question 3
GCSE Biology: Polydactyly is caused by which type of allele?
Genetic Disease Basics
Polydactyly (extra digits) is caused by a dominant allele.
Cystic fibrosis (cell membrane disorder) is caused by a recessive allele.
Exam Tip
If both parents are carriers of a recessive disorder, there is a 25% chance their child will have the condition.
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