Question

Cystic fibrosis is caused by

A. a small change in the DNA sequence of one gene.
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B. nondisjunction during meiosis in the father.
C. crossing over between X and Y chromosomes.
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D. the combined effects of several genes.

Answer 1

Answer: Cystic fibrosis is caused by a small change in the DNA sequence of one Gene.

Step-by-step explanation:

Cystic fibrosis refers to an inherited disease that affect the lungs and digestive system. It is a dangerous disorder that affect man. It's affect the cells that produce, mucus, sweat and digestive juices, making the fluid to be too thick thereby blocking the tubes and passageways. It is caused by a small change in the DNA sequence of one Gene.

Answer 2

Cystic fibrosis is caused by a small change in the DNA sequence of one gene.

Step-by-step explanation:

Cystic fibrosis is caused as a result of changes in the cystic fibrosis transmembrane conductance regulator