Question 17N.3.HL.TZ0.09a
| Date | November 2017 | Marks available | [Maximum mark: 2] | Reference code | 17N.3.HL.TZ0.09a |
| Level | HL | Paper | 3 | Time zone | TZ0 |
| Command term | Analyse | Question number | a | Adapted from | N/A |
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]
Analyse the data for the growth of nontransgenic trout and transgenic trout.
[2]
a. both transgenic «strains» show more growth/mean mass than nontransgenic
Allow vice versa
b. wild nontransgenic «strain» showed less growth than wild transgenic
Allow vice versa
OR
greatest difference between wild nontransgenic and transgenic «strains»
OR
wild «strain» showed less growth/mean mass in nontransgenic but reverse in transgenic
c. mean mass/growth in domestic nontransgenic «strain» lower than «domestic»
transgenic
d. error bars overlap for domestic nontransgenic and transgenic «strains»
[Max 2 Marks]
