What Is the Difference Between a Chromosomal Abnormality and a Single-Gene

Multiple Choice

What is the difference between a chromosomal abnormality and a single-gene defect?

A) Chromosomal abnormalities often show racial variations; single-gene defects occur in all races with similar frequency.
B) Chromosomal abnormalities affect future pregnancies; single-gene defects do not.
C) Chromosomal abnormalities are usually biological accidents occurring as a one-time occurrence; single-gene defects are hereditary.
D) Chromosomal abnormalities are hereditary; single-gene defects are usually biological accidents and a one-time occurrence.