Down's syndrome in which there is an extra copy of chromosome 21 is an example of _______, while cystic fibrosis with a "T" taking the place of a "C" at nucleotide 1609 on chromosome 7 is an example of _______.

A. Chromosomal aberration; base substitution
B. Chromosomal aberration; base insertion
C. Base insertion; base substitution
D. Base insertion; base insertion


Answer: A. Chromosomal aberration; base substitution

Biology & Microbiology

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