Question 18M.2.HL.TZ2.e
| Date | May 2018 | Marks available | [Maximum mark: 3] | Reference code | 18M.2.HL.TZ2.e |
| Level | HL | Paper | 2 | Time zone | TZ2 |
| Command term | Discuss | Question number | e | Adapted from | N/A |
To account for the observed phenotypic and metabolic differences, researchers analysed mRNA transcript data. They found certain transcripts over-represented in Arabidopsis plants grown in long days (dark grey) compared with the amount expected due to chance.
Other types of transcripts were over-represented in Arabidopsis plants grown in short days (light grey).
Using the data in the bar chart, discuss the evidence for Arabidopsis plants adapting to different daylight regimes by changing the pattern of gene expression.
[3]
a. «mRNA» transcripts differ in plants grown in long days and short days. Accept an example of such a transcript from the bar chart
b. indicates different genes are being expressed. Accept other valid reason.
c. plants adapt to different daylight regimes by altering gene expression
d. short day length causes struggle to get enough light to photosynthesize and more «mRNA» transcripts related to photosynthesis
OR
plants produce large leaves rapidly when grown in long days which may result in more transcripts for biotic stress
