DP Biology (first assessment 2025)

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Question 23M.2.SL.TZ1.b

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Date May 2023 Marks available [Maximum mark: 2] Reference code 23M.2.SL.TZ1.b
Level SL Paper 2 Time zone TZ1
Command term Deduce Question number b Adapted from N/A
b.
[Maximum mark: 2]
23M.2.SL.TZ1.b

Deduce reasons for the difference between the results of Cross 2 and Cross 3.

[2]

Markscheme
  1. (1:1 ratio) in cross 2 as banded parent is heterozygous/has one copy of each allele;
  2. (no unbanded offspring) in cross 3 as banded parent is homozygous/has two alleles for banded;
  3. (in crosses 2 and 3) banded parental phenotypes are the same but their genotypes are different;

 

 

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