DP Biology (last assessment 2024)
Question 19M.2.SL.TZ1.b
| Date | May 2019 | Marks available | [Maximum mark: 1] | Reference code | 19M.2.SL.TZ1.b |
| Level | SL | Paper | 2 | Time zone | TZ1 |
| Command term | Identify | Question number | b | Adapted from | N/A |
b.
[Maximum mark: 1]
19M.2.SL.TZ1.b
The image shows the chromosomes from a body cell of an adult human.
[Source: http://www.ornl.gov/sci/techresources/Human_Genome/graphics/slides/elsikaryotype.shtml,
U.S. Department of Energy Human Genome Program.]
Identify the chromosome that is affected by a trisomy in this individual, naming the condition that this trisomy gives rise to.
Chromosome number:
Name of condition:
[1]
Markscheme
21 AND Down syndrome/trisomy 21 ✔
Both needed
Examiners report
The idea of 21 trisomy and Down Syndrome was very common. Rarely students made references to autism or other conditions after correctly identifying 21 trisomy. Rarely other chromosome numbers with incorrect conditions were referred to
