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Question 17N.3.HL.TZ0.b

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Date November 2017 Marks available [Maximum mark: 1] Reference code 17N.3.HL.TZ0.b
Level HL Paper 3 Time zone TZ0
Command term Suggest Question number b Adapted from N/A
b.
[Maximum mark: 1]
17N.3.HL.TZ0.b

Transgenic rainbow trout (Oncorhynchus mykiss) were produced from both wild strain and domestic strain trout, using a gene coding for growth hormone from coho salmon (Oncorhynchus kisutch). The graph shows the mean mass of the nontransgenic and transgenic trout at 8 months post-fertilization.

[Source: Reprinted by permission from Macmillan Publishers Ltd: Nature, 409, Growth of domesticated transgenic fish, R H Devlin et al., pp. 781–782, copyright 2001]

Suggest a reason for the growth differences between the nontransgenic trout and transgenic trout.

[1]

Markscheme

gene for growth hormone has been assimilated/is expressed in the transgenic trout

OR

more growth hormone produced/expressed in transgenic trout

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