The correct answer to this question is option 3, Metaphase.
The morphology of chromosomes refers to their size, shape, and structure. Interphase (option 1) is a phase of the cell cycle where the chromosomes are not condensed and can`t be observed clearly. Prophase (option 2) is the stage where the chromosomes start condensing and becoming visible, but they are not fully aligned or arranged in a specific pattern for detailed study. Zygotene (option 4) is a substage of prophase in meiosis where homologous chromosomes start pairing, but the chromosomes are not fully condensed and organized.
Metaphase (option 3) is the stage where the condensed and organized chromosomes are aligned at the equator of the cell. This arrangement allows for clear observation and study of chromosome morphology, such as their size, shape, and the presence of any structural abnormalities.