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.

Sample Questions

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

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