DP Biology (first assessment 2025)

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Question 20N.2.SL.TZ0.8b

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Date November 2020 Marks available [Maximum mark: 3] Reference code 20N.2.SL.TZ0.8b
Level SL Paper 2 Time zone TZ0
Command term Explain Question number b Adapted from N/A
b.
[Maximum mark: 3]
20N.2.SL.TZ0.8b
(b)

Explain how natural selection can cause mate selection behaviour patterns to develop in a species such as eastern bluebirds.

[3]

Markscheme

a. natural selection favours specific types of mate selection/behaviour;

b. (behaviour/mate selection) increases the chances of survival/reproduction;

c. chosen organisms/males will leave more offspring;

d. pass on gene(s) for behavior to offspring;

e. (behaviour/allele) will become more prevalent/frequent in a population;

Examiners report

It was difficult for many to provide focused answers for this question, although most candidates could provide valid partial explanations.

Syllabus sections