Which of the Following Definitions Accurately Represents the Concept of Expansion

Multiple Choice

Which of the following definitions accurately represents the concept of expansion?

A) The phenotype of a genetic condition is expressed with greater severity and at earlier ages with succeeding generations.
B) The number of trinucleotide repeat sequences within the noncoding region of a specific gene allele is increased.
C) The number of copies of a specific gene allele is amplified on one chromosome of a homologous pair.
D) A specific gene allele has at least two copies of every exon within the gene.