DP Biology (first assessment 2025)

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Question 23M.2.SL.TZ1.5a

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Date May 2023 Marks available [Maximum mark: 2] Reference code 23M.2.SL.TZ1.5a
Level SL Paper 2 Time zone TZ1
Command term Explain Question number a Adapted from N/A
a.
[Maximum mark: 2]
23M.2.SL.TZ1.5a
(a)

Explain the conclusion that can be drawn from Cross 1.

[2]

Markscheme
  1. allele/trait/gene for banded is dominant/allele for unbanded is recessive;
  2. because two banded spiders produced some unbanded offspring
    OR
    because there is a ratio of 3 banded:1 unbanded;
  3. both parents are heterozygous;

Accept answers given in the form of Punnet squares.

 

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