Question

prophase i
what important events take place during prophase i?
i. chromatin condenses to form visible chromosomes.
ii. the nucleus and nucleolus disintegrate.
iii. homologous chromosomes pair up to form tetrads.
iv. chromosomes line up down the middle of the cell.
a. i only
b. i, ii, and iii
c. i and iv
d. i, ii, iii, and iv

Explanation:

• I: Chromatin condensing into visible chromosomes is a key event in Prophase I.
• II: Disintegration of the nucleus and nucleolus occurs during Prophase I.
• III: Homologous chromosomes pairing up to form tetrads (synapsis) is a characteristic of Prophase I.
• IV: Chromosomes lining up down the middle of the cell (metaphase plate) is a feature of Metaphase, not Prophase I.

Answer:

B. I, II, and III