NEET BIOLOGY

Detailed explanation-1: -Because DNA has already replicated, each chromosome actually consists of two identical copies. The two copies of a chromosome are called sister chromatids. Sister chromatids are joined together at a region called a centromere. Figure 7.3.

Detailed explanation-2: -Each chromosome would have two sister chromatids attached together in a region called the centromere. The sister chromatids contain identical copies of the organism’s DNA.

Detailed explanation-3: -A chromatid is one of the two identical halves of a chromosome that has been replicated in preparation for cell division. The two “sister” chromatids are joined at a constricted region of the chromosome called the centromere.

Detailed explanation-4: -A sister chromatid refers to the identical copies (chromatids) formed by the DNA replication of a chromosome, with both copies joined together by a common centromere.

Detailed explanation-5: -After DNA replication, each chromosome becomes composed of two identical copies (called sister chromatids) that are held together at the centromere until they are pulled apart during meiosis II (Figure 1).