2021TrialShort answer

Q21

2 marks

Question

The figure below represents an individual's karyotype.
With reference to the above diagram, describe the information that can be obtained from a karyotype.

Try the question before revealing the answer.

Solution

Criteria	Marks
• Explains that the gender and any chromosomal mutations/disorders can be determined	2
• Some relevant information	1

Sample answer:

A karyotype displays all the chromosomes, in pairs, for an individual, if there is a mutation this can be seen from insertions or deletions. Karyotypes also show the sex chromosomes and can be used to determine an individual’s gender. This individual is a male, based on the X,Y chromosomes and they have a trisomy mutation at chromosome 21.

Comment:

Most students answered correctly including. No need to include details about the disorder/symptoms. The question asks for a description of the karyotype not an explanation of the outcome/disorder. You need to include specific information that can be determine about this individual. Include gender. Range 1-2 Avg. 1.50

Supplied marking guidance · human reviewed

Compare this with your working, not only your final sentence.

Syllabus alignment

Module 5 · Heredity

Inheritance Patterns in a PopulationInvestigate DNA sequencing and profiling technologies used to determine inheritance patterns.

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