| Date | November 2021 | Marks available | 1 | Reference code | 21N.1.SL.TZ0.14 |
| Level | Standard level | Paper | Paper 1 | Time zone | TZ0 / no time zone |
| Command term | Question number | 14 | Adapted from | N/A |
Question
Down syndrome can be detected before birth by chorionic villus sampling. From where are the cells for this test taken?
A. Amniotic fluid surrounding the fetus
B. Fetal digestive system
C. Tissue in the placenta
D. Lining of the uterus of the mother
Markscheme
C
Examiners report
This was another area of the program that was obscure for most SL candidates. Confusion with amniocentesis was forgivable.
Syllabus sections
- 22M.1.HL.TZ1.12: Which process occurs in meiosis but not in mitosis? A. Attachment of spindle fibres to the...
- 18M.1.SL.TZ1.15: What helps make the genome of each human unique?
- 16N.1.HL.TZ0.13: What description is matched with the correct phase in meiosis I?
- 17M.1.SL.TZ1.16: During which phase of the first division of meiosis can non-disjunction take place and what...
- 17M.1.SL.TZ2.14: Which is a characteristic of the pairs of sister chromatids that are visible during...
- 17M.1.SL.TZ1.14: The micrographs show four different phases from meiosis II. What is the correct order? A....
- 18M.2.HL.TZ2.3a.i: The micrograph shows a plant cell of Lilium grandiflorum during meiosis. Identify, giving...
- 17M.1.SL.TZ2.27: The bacterium Neisseria gonorrhoeae causes infections related to the human reproductive...
- 18M.1.SL.TZ2.14: What happens during meiosis I and meiosis II?
- 19M.2.HL.TZ1.2c.ii: State the haploid number for this nucleus.
- 18M.1.HL.TZ1.35: What forms when two different chromatids of the same homologous pair cross over? A. Daughter...
- 17M.1.SL.TZ1.21: Cladograms can be created by comparing DNA or protein sequences. The cladogram on the left is...
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19M.1.SL.TZ2.13:
The graph shows the incidence of trisomy resulting from non-disjunction in pregnancies at different maternal ages.
[Source: Center for Disease Control]
What can be inferred from the graph?
A. The incidence of three copies of a chromosome increases directly in proportion with the age of the mother.
B. The incidence of three sets of chromosomes increases from age 20.
C. The incidence of three copies of a chromosome increases the most from age 35.
D. The incidence of three sets of chromosomes increases the most from age 30.
- 21M.1.SL.TZ1.19: Which statement applies to meiosis and mitosis? A. Meiosis occurs in a greater number of...
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21N.2.SL.TZ0.6b:
Explain the need for halving the chromosome number during a sexual life cycle and how this is done.
- 17M.2.HL.TZ1.1f.ii: Suggest a reason for the greater expression of the gene for the urea transporter after an...
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19M.1.SL.TZ1.14:
At which stage of meiosis are bivalents formed?
A. Interphase
B. Prophase I
C. Prophase II
D. Metaphase II
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20N.2.SL.TZ0.6b:
Outline what occurs in cells in the first division of meiosis.
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21M.2.SL.TZ2.2c:
Distinguish between the outcomes of a cell dividing either by mitosis or meiosis.
- 17M.2.SL.TZ1.1c: Estimate how much smaller drilled oysters raised in seawater at a high CO2 concentration were...
- 18M.1.HL.TZ2.17: Which process could cause non-disjunction if it occurred during meiosis? A. Sister...
- 22M.1.SL.TZ1.15: What is produced by meiosis in a cell of a male animal? A. Four gametes, each with the same...
- 22M.2.SL.TZ1.7b: Distinguish between the processes of meiosis and mitosis.
