DP Biology (first assessment 2025)

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Question SPM.2.HL.TZ0.b

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Date May Specimen-2023 Marks available [Maximum mark: 2] Reference code SPM.2.HL.TZ0.b
Level HL Paper 2 Time zone TZ0
Command term Explain Question number b Adapted from N/A
b.
[Maximum mark: 2]
SPM.2.HL.TZ0.b

Explain whether these results fit the predicted Mendelian ratios for this cross.

[2]

Markscheme
  1.  independent assortment predicts 1:1:1:1
     OR
     this (mendelian) ratio not seen / recombinants less frequent/parental types more frequent;
  2.  suggests linkage
     OR
     small numbers so could be a result of differential survival;

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