Question

Explain the different stages of prophase 1 of meiosis 1

Answer 1

Answer:

hii

your answer is here !

Explanation:

The various stages in meiotic - prophase 1 are as follows - 1. Leptotene or Leptonema - Chromosomes are visible and they appear as beaded structures. Centrioles duplicate and start moving towards the opposite poles. 2. Zygotene or Zygonema - Pairing of homologous chromosomes, i.e. synapse, occurs to form bivalents.

follow me !

Answer 2

Answer:

Explanation:

The various stages in meiotic - prophase 1 are as follows - 1. Leptotene or Leptonema - Chromosomes are visible and they appear as beaded structures. Centrioles duplicate and start moving towards the opposite poles. 2. Zygotene or Zygonema - Pairing of homologous chromosomes, i.e. synapse, occurs to form bivalents.Leptotene

Leptotene is the first of five stages of Prophase 1 and consists of the condensing of the already replicated chromosomes, this procedure continues throughout Prophase 1. The chromosomes become visible by using electron microscopy, which can distinguish between sister chromatids[3]. The appearance of the chromosomes at this stage of Prophase 1 is likened to 'a string with beads'[4], these beads are called chromomeres. Each sister chromatid is attached to the nuclear envelope and are so close together that they can be mistaken for only one chromosome[5]. This is a very short stage of Prophase 1.

Zygotene

Zygotene is the sub-stage where synapsis between homologous chromosomes begins. It is also known as zygonema. These synapsis can form up and down the chromosomes allowing numerous points of contact called 'synaptonemal complex'[6], this can be compared to a zipper structure, due to the coils of chromatin[7]. The synaptonemal complex facilitates synapsis by holding the alligned chromosomes together[8]. After the homologous pairs synapse they are either called tetrads or bivalents. Bivalent is more commonly used at an advanced level as it is a better choice due to similar names for similar states (a single homolog is a 'univalent', and three homologs are a 'trivalent')[9].