Answer #1:
A chromatid (Greek khrōmat- 'color' + -id) is one-half of a duplicated chromosome. Before replication, one chromosome is composed of one DNA molecule. In replication, the DNA molecule is copied, and the two molecules are known as chromatids.
Answer #2:
A replicated chromosome contains two identical double-strand -DNA- molecules, the chromatids, that are joined at their centromere. ... Each chromosome consists of two chromatids. Diploid is the term for cells with a double number of chromosomes (2n), whereby one set of chromosomes is a homolog to the other.
