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 is incorrect as trisomy means the presence of an extra chromosome. The karyotype comparisons do not indicate any evident extra chromosome in the tumorous cells specifically.
Step 2
B. The karyotype of tumour cells contains multiple chromosomal inversions.
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Answer
There is no evidence of chromosomal inversions in the provided karyotype diagrams. Thus, this statement does not hold true.
Step 3
C. The karyotype of tumour cells contains both chromosomal insertions and deletions.
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This statement is correct. The presence of the marker chromosomes (M1, M2, M3, M4) indicates chromosomal alterations such as insertions and deletions that differentiate the tumour cells from 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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Answer
While the tumour cells have additional chromosomes, the presence of the same number of normal chromosomes does not uniquely confirm this statement as stated.
