What is the difference between a chromatid and a chromosome? a. chromatids consist of dna, whereas chromosomes consist of proteins. b. chromosomes are always replicated, whereas chromatids are not. c. a chromatid always consists of two linear dna molecules, whereas a chromosome always consists of just one linear dna molecule. d. a chromatid is one half of a replicated chromosome, whereas a chromosome consists of dna wrapped around proteins in a highly organized manner?