Question

What is the sub stages prophase 1 of meiosis 1? Explain briefly.

Answer 1

Hint:Meiosis takes place only in sexually reproducing organisms. Prophase 1 of meiosis is essentially the crossing over and recombination of genetic material between non sister chromatids which results in the genetically identical, haploid daughter chromatid cells.

Complete answer:
To answer this question, first, we need to know about meiosis. The process that decreases the chromosomes number from diploid to haploid in cell division in sexually reproducing species is known as meiosis. Meiosis requires two consecutive nucleus divisions and contributes to the development of animal reproductive cells (gametes) and to the development of spores in fungi, plants, and most algae.
The prophase 1 of meiosis occurs in 5 stages given below-
Leptotene – In this stage the chromosomes start to condense and are attached to the nuclear membrane via their telomeres.
Zygotene – Here Synapsis begins with a synaptonemal complex developing between homologous chromosomes.
Pachytene – In this stage crossing over of genetic material takes places between non-sister chromatids.
Diplotene – In this stage synapsis ends with the disappearance of synaptonemal complex; homologous pairs remain linked at chiasmata.
Diakinesis – At last, chromosomes become fully condensed and the nuclear membrane disintegrates prior to metaphase 1.

Note:Meiosis is a reduction division. Meiosis 1 separates the pair of homologous chromosomes and decreases the diploid cell to haploid. It is separated into different stages which are prophase, metaphase, anaphase and telophase.