DP Biology (first assessment 2025)

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Question 21N.1A.SL.TZ0.15

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Date November 2021 Marks available [Maximum mark: 1] Reference code 21N.1A.SL.TZ0.15
Level SL Paper 1A Time zone TZ0
Command term Question number 15 Adapted from N/A
15.
[Maximum mark: 1]
21N.1A.SL.TZ0.15

In humans, male pattern baldness is caused by a recessive sex-linked gene found only on the X chromosome.

If a father who does not have male pattern baldness and a mother who is a carrier for it have a child, what is the probability that the child will develop male pattern baldness in adulthood?

A. 0 %

B. 25 %

C. 50 %

D. 75 %

[1]

Markscheme

B

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