Question

________ is the phase of mitosis where the genetic material (chromosomes) first become visible as they shorten or condense.

a) interphase
b) prophase
c) metaphase
d) anaphase
e) telophase

Explanation:

• Interphase: This is not a phase of mitosis. It is the stage where the cell prepares for mitosis by growing and replicating DNA. Chromosomes are not visible as distinct structures here.
• Prophase: In this mitosis phase, chromatin (the less - condensed form of genetic material) condenses into visible chromosomes.
• Metaphase: Chromosomes are already visible in prophase. In metaphase, chromosomes align at the cell's equatorial plane.
• Anaphase: Sister chromatids separate and move towards opposite poles. Chromosomes were already visible in prophase.
• Telophase: Chromosomes start to de - condense. They were visible in prophase.

Answer:

B. Prophase