Which statement regarding chromosome structure or function is true?

A: The chromatids of any single chromosome are known as â??sister chromatids.â?�

B: The genes located on the telomeres of chromosomes are identical to the genes in the centromeres.

C: Immediately before the mitosis phase of cell division, the chromosomes of all somatic cells are haploid.

D: A specific gene allele on one chromosome has a complementary allele on the other chromosome of a pair.