Question

question 25
the karyotype below depicts a mutation on chromosome #23. this type of mutation is due to ______.

(image of karyotype with chromosomes numbered 1 - 22 and a circled xyy for chromosome 23, and multiple - choice options: a nondisjunction, b translocation, c deletion, d down syndrome)

Explanation:

The karyotype shows XYY, a condition caused by nondisjunction (failure of chromosomes to separate properly during meiosis, leading to an extra Y chromosome). Translocation involves chromosome segment transfer, deletion is loss of a segment, and Down syndrome is trisomy 21 (not XYY). So the correct cause is nondisjunction.

Answer:

a. nondisjunction