Question

the karyotype above illustrates..
○ a deletion
○ a monosomy
○ a trisomy
○ none of the choices are accurate

Explanation:

To determine the correct option, we analyze the karyotype:

1. Identify Chromosome Abnormality: A karyotype shows chromosome pairs. In this case, chromosome 21 has three copies (trisomy 21, Down syndrome).
2. Evaluate Options:

• Deletion: Involves loss of chromosome segment (not seen here).
• Monosomy: Missing one chromosome (not seen here).
• Trisomy: Extra chromosome (chromosome 21 has three, so trisomy).
• "None..." is incorrect as trisomy is present.

Answer:

C. a trisomy