2023TrialShort answer

Q25

3 marks

Question

The following graph, which shows the distance between the sister chromatids of a replicated chromosome during a mitotic cell division: Draw diagrams to show the arrangement of the chromosomes at 10 minutes, 15minutes and at 20 minutes in a diploid cell containing four chromosomes. Pattern at 10min. Pattern at 15 min Pattern at 20min

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Solution

Criteria	Marks
Cells have the correct chromosome number.<br>Sister chromatids are connected and aligned appropriately for the cell-division stage.<br>Distance is proportional to the graph data.	3

Deduct one mark for any missing point.

Sample answer:

10 mins
(0 μm distance)
[Hand-drawn diagram: a cell containing four X-shaped chromosomes aligned vertically.]
Metaphase

15 mins
(20 μm distance)
[Hand-drawn diagram: a cell containing four separated chromosome groups moving toward opposite poles.]
Early Anaphase

20 mins
(40 μm distance)
[Hand-drawn diagram: a cell containing separated chromosome groups near opposite poles.]
Late anaphase

Supplied marking guidance · human reviewed

Compare this with your working, not only your final sentence.

Syllabus alignment

Module 5 · Heredity

Cell ReplicationModel mitosis, meiosis and DNA replication using nucleotide pairing and bonding.
Cell ReplicationAssess how cell-replication processes affect continuity of species.

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