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.
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How many autosomes are shown in the diagram?
Name the type of chromosomes represented by p... 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 the non-sex chromosomes, and in humans, there are typically 22 pairs.
Step 2
Name the type of chromosomes represented by pair 23.
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Answer
Pair 23 represents the sex chromosomes, also known as gonosomes.
Step 3
(a) Name the disorder represented in the diagram.
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Answer
The disorder represented in the diagram is Down syndrome, also referred to as Trisomy 21, characterized by an extra copy of chromosome 21.
Step 4
(b) Process during anaphase of meiosis that resulted in the abnormal number of chromosomes in this karyotype.
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The process is known as non-disjunction, which occurs when homologous chromosomes fail to separate properly during meiosis.
Step 5
(c) State the gender of the person represented in this karyotype.
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The gender of the person represented in this karyotype is male, as indicated by the presence of one X and one Y chromosome in the sex chromosome pair.
