Prophase-1 || Meiosis Part-3 || Vinay Biology
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Leptotene
Also called thin-threaded stage.
Volume of nucleus increases.
Formation of aster.
Condensation of nuclear chromatin by dehydration.
Chromosome appears long thread like and made of two sister chromatids.
Zygotene
Also called yoked-threaded stage.
Pairing of homologous chromosomes occurs. This is called synapsis or syndesis.
Formation of bivalents.
Pairing of homologous chromosomes in a zipper-fashion.
Pachytene
Also called thick-threaded stage.
Further condensation of chromosomes.
Sister chromatids are visible which are joined at the centromere and is known as dyad.
Crossing over occurs between two non-sister chromatids of homologous chromosomes.
Crossing over is regulated by recombinase enzyme.
Diplotene
Called double threaded stage.
Longest duration.
Nuclear membrane and nucleoli start disappearing.
The homologous chromosomes start separating.
The point of attachment or crossing over is known as chiasmata.
The chiasmata starts moving towards the ends of chromosomes called terminalisation.
Diakinesis
Terminalisation is completed.
The non-sister chromatids remain in contact with each other at the telomeres.
Complete disappearance of nuclear membrane and nucleoli.
##VinayBiology ##prophase-1##Cell cycle
1.sporulation in amoeba
https://www.youtube.com/watch?v=n6DS-...
2.secondary growth in dicot stem part-1
https://www.youtube.com/watch?v=QzVnT...
3. secondary growth in dicot stem part-2
https://www.youtube.com/watch?v=9ixS1...
4.Sliding filament theory
https://www.youtube.com/watch?v=dduy6...
5.Fertillisation in cockroach
https://www.youtube.com/watch?v=dLnNY...
6.Factors affecting Hardy wienberg principle
https://www.youtube.com/watch?v=Y2nzx...
7.Ecological Succession
https://www.youtube.com/watch?v=oenDs...
8. Hardy wienberg principle
https://www.youtube.com/watch?v=FUden...
9.Linkage and Recombination
https://www.youtube.com/watch?v=mR_-v...
10.Polymerase Chain Reaction
https://www.youtube.com/watch?v=pVgsx...
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Видео Prophase-1 || Meiosis Part-3 || Vinay Biology канала Vinay Biology
11th Togetherwith/https://amzn.to/2lnQ483
12th Exam idea/https://amzn.to/2ltL8i0
12th Togetherwith/ https://amzn.to/2lRAZf9
11th Trueman/ https://amzn.to/2ka70i6
12th Trueman/ https://amzn.to/2lQSKLz
NEET Fingertips Biology in Hindi/ https://amzn.to/2kjZ25M
NEET Physics+chem+Bio fingertips Combo/ https://amzn.to/2k7BMIp
Leptotene
Also called thin-threaded stage.
Volume of nucleus increases.
Formation of aster.
Condensation of nuclear chromatin by dehydration.
Chromosome appears long thread like and made of two sister chromatids.
Zygotene
Also called yoked-threaded stage.
Pairing of homologous chromosomes occurs. This is called synapsis or syndesis.
Formation of bivalents.
Pairing of homologous chromosomes in a zipper-fashion.
Pachytene
Also called thick-threaded stage.
Further condensation of chromosomes.
Sister chromatids are visible which are joined at the centromere and is known as dyad.
Crossing over occurs between two non-sister chromatids of homologous chromosomes.
Crossing over is regulated by recombinase enzyme.
Diplotene
Called double threaded stage.
Longest duration.
Nuclear membrane and nucleoli start disappearing.
The homologous chromosomes start separating.
The point of attachment or crossing over is known as chiasmata.
The chiasmata starts moving towards the ends of chromosomes called terminalisation.
Diakinesis
Terminalisation is completed.
The non-sister chromatids remain in contact with each other at the telomeres.
Complete disappearance of nuclear membrane and nucleoli.
##VinayBiology ##prophase-1##Cell cycle
1.sporulation in amoeba
https://www.youtube.com/watch?v=n6DS-...
2.secondary growth in dicot stem part-1
https://www.youtube.com/watch?v=QzVnT...
3. secondary growth in dicot stem part-2
https://www.youtube.com/watch?v=9ixS1...
4.Sliding filament theory
https://www.youtube.com/watch?v=dduy6...
5.Fertillisation in cockroach
https://www.youtube.com/watch?v=dLnNY...
6.Factors affecting Hardy wienberg principle
https://www.youtube.com/watch?v=Y2nzx...
7.Ecological Succession
https://www.youtube.com/watch?v=oenDs...
8. Hardy wienberg principle
https://www.youtube.com/watch?v=FUden...
9.Linkage and Recombination
https://www.youtube.com/watch?v=mR_-v...
10.Polymerase Chain Reaction
https://www.youtube.com/watch?v=pVgsx...
Facebook-https://www.facebook.com/VBIOLOGY1127/
Twitter-https://twitter.com/BiologyVinay?s=03
snapchat-https://www.snapchat.com/add/vinay11273
Видео Prophase-1 || Meiosis Part-3 || Vinay Biology канала Vinay Biology
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