DP Biology (first assessment 2025)

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Question 20N.2.SL.TZ0.a

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Date November 2020 Marks available [Maximum mark: 1] Reference code 20N.2.SL.TZ0.a
Level SL Paper 2 Time zone TZ0
Command term Identify Question number a Adapted from N/A
a.
[Maximum mark: 1]
20N.2.SL.TZ0.a

Identify the genotype of the male wire-haired dog.

[1]

Markscheme

WwKk

Examiners report

Only 40 % of candidates answered this correctly. A surprisingly high number of candidates gave a genotype with only one allele for each gene, suggesting that they were not familiar with dihybrid crosses. In many cases it was hard to distinguish between upper and lower case letters -W/w and K/k. Candidates should be encouraged to make letters used for alleles as clear as possible.

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