Question

which part of the chromosome is responsible for holding the two sister chromatids together? centromere chromatin gene nucleus

Explanation:

To determine which part of the chromosome holds the two sister chromatids together, we analyze each option:

• Centromere: The centromere is the region of a chromosome where the two sister chromatids are joined together. It plays a crucial role in cell division, as it is the attachment point for spindle fibers.
• Chromatin: Chromatin is the complex of DNA and proteins that makes up chromosomes, but it is not responsible for holding sister chromatids together.
• Gene: A gene is a segment of DNA that codes for a specific protein or RNA molecule; it has no role in holding chromatids together.
• Nucleus: The nucleus is the organelle that contains chromosomes, but it is not a part of the chromosome itself and does not hold sister chromatids together.

Answer:

A. Centromere