Mitotic Cell Cycle / Nucleic Acids
7. A student observed the cells in the growing region (meristem) of an onion root and obtained
data shown.
stage
number of cells in
interphase-886
Prophase-73
Metaphase-16
anaphase-14
telophase-11
Which percentage of cells contains chromosomes that appear as two chromatids?
A 7.3
B 8.9
C95.9
D97.5
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97.5% of cells contain chromosomes that appear as two chromatids.
- A chromatid is one of two identical halves of a replicated chromosome.
- Chromosome replication occurs in S-phase of interphase.
- So, cells in interphase, prophase, and metaphase have two chromatids.
- Chromatids get separated during the anaphase.
- Cells in anaphase and telophase have a single chromosome.
- Cells with two chromatids = 886+73+16=975
- Total number of cells= 886+73+16+14+11=1000
- Percentage= (975/1000)x100 = 97.5%
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