DP Biology (first assessment 2025)

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Question 22N.1A.SL.TZ0.13

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Date November 2022 Marks available [Maximum mark: 1] Reference code 22N.1A.SL.TZ0.13
Level SL Paper 1A Time zone TZ0
Command term Question number 13 Adapted from N/A
13.
[Maximum mark: 1]
22N.1A.SL.TZ0.13

What is a difference between two alleles of a gene?

A.  Their positions on homologous chromosomes

B.  Their amino acid sequence

C.  The characteristic they influence

D.  Their base sequence

[1]

Markscheme

D

Examiners report

The candidates were asked for the differences between two alleles of a gene. The question performed quite well statistically. It was suggested that response B should be considered as a suitable answer at SL but this was considered wrong as a gene consists of nucleotides.

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