What process can account for the phenomenon wherein a normal xy male produces a sperm carrying two y chromosomes?
a.) first division nondisjunction
b.) disjunction
c.) second division nondisjunction
d.) copy-number variation
e.) translocation

The correct answer will be option-C

Explanation:

Non-disjunction is the failure of the separation of the chromosomes during the separation phase of the division that anaphase I and anaphase II of meiosis.

The non-disjunction takes place during meiosis which takes place in the gamete formation.

A condition which develops from the non-disjunction with one extra copy of the Y chromosome is known as 47, XYY condition or Klinefelter syndrome.

This extra copy of the Y chromosome takes place when the chromosome separation failure takes place during anaphase II of meiosis II. This separation creates one extra copy of the chromosome.

Thus, Option-C is the correct answer.