What represents the correct order of events during prophase I?
A) Pachytene - diplotene - diakinesis - leptotene - zygotene
B) Leptotene - zygotene - pachytene - diplotene - diakinesis
C) Zygotene - leptotene - pachytene - diakinesis - diplotene
D) Diplotene - pachytene - leptotene - diakinesis - zygotene

Question

Quizplus · Accepted Answer

The correct order of events during prophase I is as follows:
1. Leptotene - chromosomes condense and become visible, appearing as long thin threads.
2. Zygotene - homologous chromosomes pair up in a process called synapsis, forming bivalents. This is also when crossing over occurs.
3. Pachytene - the bivalents become shorter and fatter, and the crossing over points become visible. This is when genetic recombination occurs.
4. Diplotene - the homologous chromosomes start to pull away from each other but remain attached at points of crossing over, forming chiasmata.
5. Diakinesis - the nuclear envelope starts to break down, and the chromosomes become even more condensed and are prepared for metaphase I.

What Represents the Correct Order of Events During Prophase I