Final Answer:
1. Cell membrane: outer boundary (label 4); cytoplasm: jelly-like interior (label 3); nucleus: large central organelle (label 1); chromosomes: thread-like structures inside nucleus (label 2).
2. 4
3. Chromosomes have duplicated (each now consists of two sister chromatids joined at the centromere).
4. The mitotic spindle (made of microtubules) has formed.
5. The nucleus has broken down (nuclear envelope disappeared).
6. Chromosomes are now lined up single-file along the equator (metaphase plate) of the cell, attached to spindle fibers from opposite poles.
7. Sister chromatids have separated and are being pulled toward opposite poles of the cell.
8. Chromosomes have reached the poles; nuclear envelopes have reformed around each set; chromosomes begin to unwind back into chromatin; spindle disappears.
9. The two new cells are genetically identical to the original interphase cell (same number and type of chromosomes).
Parent Tip: Review the logic above to help your child master the concept of cells alive mitosis worksheet.
