DP Biology (first assessment 2025)

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Question 23M.1A.SL.TZ1.15

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Date May 2023 Marks available [Maximum mark: 1] Reference code 23M.1A.SL.TZ1.15
Level SL Paper 1A Time zone TZ1
Command term Question number 15 Adapted from N/A
15.
[Maximum mark: 1]
23M.1A.SL.TZ1.15

Non-disjunction of chromosome 21 causes trisomy. What can be said about the incidence of non-disjunction in chromosome 21?


A.  It increases greatly with maternal age after 30 years.

B.  Chromosome 21 always suffers non-disjunction.

C.  Very young mothers have no chance of non-disjunction.

D.  There is no relation between age and the probability of non-disjunction.

[1]

Markscheme

A

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