Prophase

Prophase I:

It is the initial phase of first meiosis. This is the longest phase of the meiotic division. It comprises 5 sub-phases viz.:

Leptotene:

The term leptotene means ‘thin thread’. The chromosomes uncoil and become big and thinner. Each chromosome comprises of two chromatids.

Zygotene:

Homologous chromosomes approach together and lie side by side all through their length. This is termed as synapsis or pairing. The paired chromosomes are now termed as bivalents. The adjacent non-sister chromatids are joined altogether at some points termed as chiasmata.

Pachytene:

The chromosomes are then condense and become very shorter and thicker. They are very different now. The two sister chromatids of each homologous chromosome become evidently visible. The bivalent therefore becomes a tetrad with four chromatids. In the area of chiasmata, segments of non-sister chromatids of the homologous chromosomes are exchanged and this procedure is termed as crossing over.

Diplotene:

The homologous chromosomes are again condensed. They start to separate from each other apart from at the chiasmata. Due to this separation the dual nature of a bivalent becomes obvious and therefore the name diplotene.

Diakinesis:

The Chromosomes carry on to contract. The separation of chromosome becomes complete due to the terminalisation. The separation begins from the centromeres and goes towards the end and therefore the name terminalisation:

The nucleolus and nuclear membrane vanish and spindle formation begins.

Latest technology based Biology Online Tutoring Assistance

Tutors, at the www.tutorsglobe.com, take pledge to provide full satisfaction and assurance in Cell Division homework help via online tutoring. Students are getting 100% satisfaction by online tutors across the globe. Here you can get homework help for Cell Division, project ideas and tutorials. We provide email based Cell Division homework help. You can join us to ask queries 24x7 with live, experienced and qualified online tutors specialized in Cell Division. Through Online Tutoring, you would be able to complete your homework or assignments at your home. Tutors at the TutorsGlobe are committed to provide the best quality online tutoring assistance for Biology homework help and assignment help services. They use their experience, as they have solved thousands of the Biology assignments, which may help you to solve your complex issues of Cell Division. TutorsGlobe assure for the best quality compliance to your homework. Compromise with quality is not in our dictionary. If we feel that we are not able to provide the homework help as per the deadline or given instruction by the student, we refund the money of the student without any delay.

©TutorsGlobe All rights reserved 2022-2023.