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Question 22M.1.HL.TZ2.36

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Date May 2022 Marks available [Maximum mark: 1] Reference code 22M.1.HL.TZ2.36
Level HL Paper 1 Time zone TZ2
Command term Question number 36 Adapted from N/A
36.
[Maximum mark: 1]
22M.1.HL.TZ2.36

Three-spined stickleback fish (Gasterosteus aculeatus) vary in the number of armour plates. The graph shows the frequency of individuals with low, partial or complete plating in a three-spined stickleback population living in Kennedy Lake, Vancouver Island, Canada.

[Source: Reprinted from Current Biology, 24, Marchinko, K.B., Matthews, B., Arnegard, M.E., Rogers, S.M. and Schluter, D., Maintenance of a Genetic Polymorphism with Disruptive Natural Selection in Stickleback.
2014.  pp.1289–1292 with permission from Elsevier.]

 

Which type of natural selection could result in this pattern of variation in the population?

A. Disruptive

B. Directional

C. Stabilizing

D. Convergent

[1]

Markscheme

A

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