Which of the following explanations best describes the difference between cystic fibrosis and down syndrome?
a. down syndrome is caused by a dna mutation, while cystic fibrosis is caused by a change in the structure of a chromosome.
b. down syndrome is caused by change in the number of a chromosome, while cystic fibrosis is caused by a dna mutation.
c. down syndrome is caused by a change in the number of a chromosome, while cystic fibrosis is caused by a change in the structure of a chromosome.
d. down syndrome is caused by a dna mutation, while cystic fibrosis is caused by a change in the number of a chromosome.