The diagram below represents part of an abnormal human karyotype - NSC Life Sciences - Question 1 - 2022 - Paper 2
Question 1
The diagram below represents part of an abnormal human karyotype.
How many autosomes are shown in the diagram?
Name the type of chromosomes represented by pair 23.... show full transcript
Worked Solution & Example Answer:The diagram below represents part of an abnormal human karyotype - NSC Life Sciences - Question 1 - 2022 - Paper 2
Step 1
How many autosomes are shown in the diagram?
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Answer
There are 22 autosomes shown in the diagram. Autosomes are non-sex chromosomes, and they are depicted as pairs 1 through 22 in a karyotype.
Step 2
Name the type of chromosomes represented by pair 23.
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Answer
The type of chromosomes represented by pair 23 are the sex chromosomes, also known as gonosomes. They determine the biological sex of an individual.
Step 3
Name the disorder represented in the diagram.
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Answer
The disorder represented in the diagram is Down syndrome, which is also referred to as Trisomy 21 due to the presence of an extra chromosome 21.
Step 4
Process during anaphase of meiosis that resulted in the abnormal number of chromosomes in this karyotype.
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Answer
The process that caused the abnormal number of chromosomes in this karyotype is called non-disjunction. This occurs when chromosomes fail to separate properly during meiosis.
Step 5
State the gender of the person represented in this karyotype.
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Answer
The gender of the person represented in this karyotype is male, as indicated by the presence of one X and one Y chromosome.
