Question

e. With the help of suitable diagrams.
explain the five stages of prophase-1
of meiosis
​

Answer 1

Answer:

please search for the diagram in google as you'll get a better diagram in detail

PROPHASE I is the longest phase of meiosis-1 this includes 5 sub stages:

LEPTOTENE

1. All the chromosomes cluster together towards centrioles and appear like a BOUQUET
2. chromosomes become visible as LONG and THICK
3. In ANIMAL cell this cluster is called as BOUQUET
4. In PLANT cel this cluster is called SYNIZESIS

ZYGOTENE

1. Pairing of chromosome occur between HOMOLOGUS chromosome only
2. pairing of homologus chromosomes take place and this process is called SYNAPSIS
3. paired homologus chromosomes are also called as BILATERAL or TETRAD
4. pairing is mediated by a NUCLEOPROTEIN COMPLEX called as SYNAPTONEMAL COMPLEX

PACHYTENE

1. Crossing over on recombination occur between NON SISTER CHROMATIDS of HOMOLOGUS CHROMOSOMES
2. Bivalents or Tetrads are clearly visible
3. Crossing over is mediated by an enzymes called RECOMBINASE which activity binds at recombinase nodule to complete the process of crossing over

DIPLOTENE

1. LONGEST PHASE
2. At the point of cross over a X shaped sturture is formed called as CHIASMATA
3. Dissolution of synaptonemal complex take place and it lead to seperation of chromosome at all the points except at the point of cross over

DIAKINESIS

1. Spindle and aster are formed
2. Centrioles move to opposite poles
3. Terminalisation of chiasmata take place which lead to the seperation of chromatids
4. Disappearance of nuclear memebrane and nucleolus

• I HOPE THIS WAS HELPFUL