DP Biology (last assessment 2024)

Test builder »

Question 22M.1.HL.TZ2.35

Select a Test
Date May 2022 Marks available [Maximum mark: 1] Reference code 22M.1.HL.TZ2.35
Level HL Paper 1 Time zone TZ2
Command term Question number 35 Adapted from N/A
35.
[Maximum mark: 1]
22M.1.HL.TZ2.35

When a cell divides by meiosis, chiasmata can be observed. Which are features of chiasmata?

I. They are points of attachment between chromatids of non-homologous chromosomes.

II. They occur during meiosis I.

III. They increase stability of bivalents.

A. I and II only

B. I and III only

C. II and III only

D. I, II and III

[1]

Markscheme

C

Examiners report

This question discriminated well. Many weaker candidates failed to recognise that item I was incorrect as it referred to points of attachment between non-homologous (as opposed to homologous) chromosomes. This would have been sufficient to eliminate all the incorrect responses.

Syllabus sections