The diagram shows the karyotype of a normal female Tasmanian devil cell and the karyotype of a Tasmanian devil facial tumour cell - HSC - SSCE Biology - Question 20 - 2023 - Paper 1
Question 20
The diagram shows the karyotype of a normal female Tasmanian devil cell and the karyotype of a Tasmanian devil facial tumour cell.
Normal female Tasmanian devil kar... show full transcript
Worked Solution & Example Answer:The diagram shows the karyotype of a normal female Tasmanian devil cell and the karyotype of a Tasmanian devil facial tumour cell - HSC - SSCE Biology - Question 20 - 2023 - Paper 1
Step 1
A. The karyotype of the tumour cells shows trisomy.
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Answer
This statement cannot be confirmed as the karyotypes do not explicitly indicate trisomy in the additional chromosomes.
Step 2
B. The karyotype of tumour cells contains multiple chromosomal inversions.
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There is no evidence to support the presence of multiple chromosomal inversions as we do not see any clear rearrangement indicated by the karyotype.
Step 3
C. The karyotype of tumour cells contains both chromosomal insertions and deletions.
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This statement is validated as the presence of marker chromosomes (M1, M2, M3, and M4) suggests structural alterations such as chromosomal insertions and deletions compared to the normal karyotype.
Step 4
D. The karyotype of the tumour cells contains more chromosomes than the karyotype of the normal Tasmanian devil cells.
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This statement is incorrect as the number of chromosomes (XX + typical pairs) remains consistent; however, the presence of the additional marker chromosomes gives the impression of a more complex karyotype.
