ConceptConceptDocsDocuments

IB Biology HL 2.1.5 DNA replication prerequisite and chromosome accounting Question Bank

Practise IB Biology HL 2.1.5 by analysing DNA quantity and chromatid number across the cell cycle and division stages.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Calculate chromatid or DNA quantities from chromosome number and cell-cycle stage.
  • Analyse a micrograph or description to infer the replication state before division.
  • Evaluate a chromosome-count explanation by distinguishing chromosomes from chromatids.

D2.1.5—DNA replication prerequisite question 1

[Maximum number: 1]

The image shows a cell from the root tip of an onion (Allium cepa) ( 2 n=16 ) during late prophase of mitosis.

Figure for Question D2.1.5—DNA replication prerequisite question 1 — IB Biology HL

How many chromatids are present in the cell?

A

8

B

16

C

32

D

64

All question bank results loaded