Chromosomes and Mitosis

Question 1

What are chromosomes?

Answer 1

They are coiled up legths of DNA molecules

Question 2

What is the stage of the cell cycle when the cell divides called?

Answer 2

Mitosis

Question 3

What are the two main stages of the cell cycle?

Answer 3

1.Growth & DNA Replication
2. Mitosis

Question 4

Explain the stage of growth & DNA replication in the cell cycle

Answer 4

1. In a cell that’s not dividing, the DNA is all spread out in long strings
2. Before it divides, the cell has to grow and increase the amount of subcellular structures e.g mitochondria and ribosomes
   3.It then duplicates its DNA - so there’s one copy for each new cell. Forma X-shaped chromosomes. Each ‘arm’ is an exact duplicate of the other

Question 5

What’s the stage mitosis in the cell cycle?

Answer 5

4. The chromosomes line up at the centre of the cell and cell fibres pull them apart. The two arms of each chromosome go to opposite ends of the cell
5. Membranes from around each of the sets of cheomosomes. These become the nuclei of the two new cells - the nuclues has divided
6. Lastly, the cytoplasm and cell membrane divide . The ce has now produced two new daughter cells. The daughter cells contain exactly the same DNA - they’re identical. Their DNA is identical to the parent cell.