Chromatids areA) dense patches within the nucleus. B) bacterial chromosomes. C) joined strands of duplicated genetic material. D) prokaryotic...

The answer is C. When a cell is undergoing mitosis or
meiosis, after interphase, the single --stranded chromsomes have been duplicated forming
pairs of chromatids. They are held together by a centromere. By duplicating the
chromosome material, this will insure that the proper amount of chromosomes will end up
in the daughter cells after mitosis, or in the gametes, after
meiosis.