Question

What are the 5 stages of Prophase I?

Answer 1

Prophase I:

1. The first prophase of meiosis is the longest and consists of three main stages.
2. First, chromatin condenses into chromosomes, next homologous chromosomes physically touch one another, and finally, synapsed chromosomes communicate genetic information to one another.
3. When compared to the prophase of mitosis, this phase is often longer and more complicated.

5 stages of Prophase 1 are:

Leptotene-

1. Prophase-1 of the meiosis begins with leptotene.
2. It is marked by the condensation of the chromosomes.

Zygotene-

1. The meiotic prophase stage follows leptotene and is when homologous chromosomal synapsis takes place.
2. This complex is required to hold the homologous chromosomes at a place close to each other.
3. Bivalent chromosomes are visible at this stage.

Pachytene-

1. The meiotic prophase stage immediately precedes zygotene and is characterized by thicker, clearly split paired chromosomes into chromatids and the occurrence of crossing-over.
2. The attachment point of the crossing-over of the non-sister chromatids is called chiasma.

Diplotene-

1. The fourth stage of meiosis prophase-1 is called diplotene (a five-stage process).
2. Desynapsis and chiasmata development are features of the diplotene stage.

Diakinesis-

1. The final phase of meiosis prophase-1 is diakinesis.
2. Chiasmata terminalization is a characteristic of the diakinesis stage.
3. The cell that is dividing enters metaphase after diakinesis.
4. The nuclear membrane also disappears.