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Cell Divison Part 3~1

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Cell Divison Part 3~1

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Cell Cycle & Cell Division - Mitosis - Part 3

Mitosis takes place in somatic cells and in germinal cells during multiplication phase. It is also known as equational division as the chromosome number is same in both the daughter cells and the parent cell.

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Cell Cycle and Cell Division:-
 


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Cell Cycle & Cell Division - Meiosis I - Prophase I - Part - 3

In prophase I of meiosis I crossing over between non sister chromatids takes place which results in genetic recombination and variations.

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Cell Cycle and Cell Division Part 3 | NEET | Biology | SB Ma'am

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cell divison part 1~1

Cell Cycle & Cell Division - Cell Cycle - Part 1

Cell cycle includes preparatory phase and a division phase. The phases inter phase and M phase.

Link to the online chapter test :

Cell Cycle and Cell Division:-
 


____________________________________________________________________

The study notes are available on Amazon India. The related    
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Cell Cycle & Cell Division - Mitosis - Part 1

Mitosis takes place in somatic cells and in germinal cells during multiplication phase. It is also known as equational division as the chromosome number is same in both the daughter cells and the parent cell.

Link to the online chapter test :

Cell Cycle and Cell Division:-
 


____________________________________________________________________

The study notes are available on Amazon India. The related    
affiliate links are provided below

Genetics and Evolution -

Cell: Structure and Functions -

Reproduction -

Human Physiology -  

Plant Physiology -

Biotechnology -

Free Delivery (On Selected Pin codes) !!!, Cash on Delivery Available!!!

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L3: Cell Cycle and Cell Division ( Part 3 ) | NCERT Review | Target NEET 2020 | Anand Mani

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Cell Cycle & Cell Division - Cell Cycle - Part 3

Cell cycle includes preparatory phase and a division phase. The phases inter phase and M phase.

Link to the online chapter test :

Cell Cycle and Cell Division:-
 


____________________________________________________________________

The study notes are available on Amazon India. The related    
affiliate links are provided below

Genetics and Evolution -

Cell: Structure and Functions -

Reproduction -

Human Physiology -  

Plant Physiology -

Biotechnology -

Free Delivery (On Selected Pin codes) !!!, Cash on Delivery Available!!!

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Meiosis | Cell Cycle & Cell Division (Part 3) | Class 11

Events during Meiosis are explained in very simple student friendly language and in HINDI. The video will help a lot scoring high in Board exam and Pre Medical Tests.

Support our channel:
Even a small contribution helps us maintain our channel.

Contact us for purchasing complete syllabus notes : tutorial.concept2012@gmail.com
Class XII (Complete syllabus notes) – Rs. 200
Class XI (Complete syllabus notes) – Rs. 200

Cell Cycle & Cell Division
1 Cell Cycle

2 Mitosis

3 Meiosis

4 Distribution of DNA during Cell Division


Find answers to questions asked in the video:

Answer 1: Yes

Answer 2: No, mutation is the source of variation in these organisms.

Cell Cycle and Cell Division | Biology Class 11

Meiosis: It ensures production of haploid gametes in sexually reproducing organisms where fertilization leads to formation of diploid zygote (the first cell of next generation).

Key feature of meiosis:

It involves two sequential cycles of nuclear and cell division but only a single cycle of DNA replication.

It involves pairing of homologous chromosomes and recombination between them.

Four haploid daughter cells are formed at the end of meiosis II.

Meiosis I: Two homologous chromosomes of each pair separate from each other and go to separate daughter cells. This reduces the number of chromosomes from diploid (2n) to haploid (n). Therefore meiosis I is also known as reductional division.

Prophase I: It is the longest phase and is divided into 5 sub stages:

· Leptotene

· Zygotene

· Pachytene

· Diplotene

· Diakinesis

Note: A mnemonic in hindi “Lata Zara Paani De Dena”.

Leptotene:

Chromosomes gradually become visible under microscope as slender threads.

Condensation of chromatin fibres continues.

Centrioles move a part.

Spindle begins to develop.

Zygotene: Homologous chromosomes come to lie side by side in pairs, the process is called Synapsis (Figure 10). Pairing is so through that all the corresponding points (genes) lie exactly opposite to each other. A pair of homologous chromosomes lying together is known as bivalent or tetrad. A fibrillar organelle called synaptonemal complex develops between the synapsed homologous chromosomes.

Pachytene:

This stage is characterized by appearance of recombination nodules, the sites at which crossing over occurs between non sisters chromatids of homologous chromosomes.

Crossing over is the exchange of genetic material between two homologous chromosomes. It occurs by breakage and reunion of chromatid segment.

Diplotene:

Dissolution of synaptonemal complex results in separation of homologous chromosomes of bivalents, except at the sites of crossovers. The process of separation of homologous chromosomes is called disjunction.

X-shaped structures so formed are called chiasmata.

Diakinesis:

The chiasmata disappear by sliding towards the tips of chromosomes; the process is called terminalization.

Nucleolus and nuclear membrane disintegrate.

Chromosomes lie free in cytoplasm.

Metaphase I:

Homologous chromosomes lie in two parallel metaphase plates at equator.

Microtubules from the opposite poles of spindle attach to pair of homologous chromosomes.

Anaphase I: The homologous chromosomes separate, while sister chromatids remain associated at their centromeres.

Telophase I:

Nuclear membrane and nucleolus reappear.

Cytokinesis follows.

Interkinesis: A short lived interval between two meiotic divisions.

Significance of meiosis I:

Separates homologous chromosomes so that the number of chromosomes reduces to half.

Introduces variation through crossing over.

At times causes chromosomal mutations by abnormal disjunctions.

Meiosis II: It is equational division because chromosome number remains the same as produced by meiosis I. Thus, meiosis II resembles a normal mitosis.

Prophase II:

Centrioles move apart.

Spindle is laid down between centrioles.

Chromosomes become visible due to condensation.

Nucleoli disappear.

Nuclear membrane disintegrates.

Metaphase II:

Chromosomes align at equator forming single metaphase plate.

Microtubules from opposite poles of spindle get attached to kinetochores of sister chromatids.

Anaphase II:

Centromeres of each chromosomes split.

Chromatids of each chromosome start moving towards opposite poles of the cell.

Telophase II:

Chromosomes become extended.

Spindle is lost.

Nucleoli and nuclear membrane reappears.

Meiosis II is not mitosis:

1. Occurs with haploid number of chromosomes.

2. Not proceeded by interphase.

3. Two chromatids of a chromosome are not similar due to crossing over in meiosis I.

Concept Tutorial presents ‘Meiosis’ in very simple language to help students in the best possible way.

#CellBiology
#BiologyClass11
#NEET
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BI177 Chapter 15 Cell Cycle, Mitosis, and Meiosis - Part 3 of 4

David O. Morgan (UCSF) Part 3: Controlling the Cell Cycle: Anaphase Onset



In the anaphase stage of the cell cycle, the duplicated chromosomes are pulled apart by a machine called the mitotic spindle, resulting in the distribution of a complete set of chromosomes to each of the daughter cells. In the third part of this lecture, I describe the combination of biochemistry and microscopy in my laboratory that led to the discovery of a regulatory switch that triggers the abrupt and synchronous separation of the chromosomes at the onset of anaphase.

Meiosis | Part 3 | Cell division

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MITOSIS In-Depth Study Part 3 of 4 -Class 10th - ICSE | Amoeba Classes

Hello my dear students in this video I have explained mitosis cell division. I have explained prophase metaphase anaphase and telophase in detail. I have also discussed about the difference between Plant cell and Animal cell with reference to mitosis. I have also discussed that if centriole is absent in plant cell then who is responsible for the formation of spindle fibre. so watch the full video. I hope you all will enjoy...


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Amoeba Classes is an online as well as offline coaching classes for 9th and 10th for Physics,Chemisty and Biology.
It also teaches BIOLOGY for class 11th and 12th, both ICSE/ISC and CBSE board.
Amoeba Classes is located in Jhansi,UP and provides quality education to each and every student.

The Founder of Amoeba Classes Believes That One Day He Will Change The Bad Education System Of India

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CELL DIVISION PART 3 MEIOSIS

This video is about meiosis of cell division and this chapter explains complete chapters and mcq practice in four parts part 1 introduction of cell division and interphase part 2mitosis part 3 meiosis part 4 mcq practice.
My self Prof Nilesh P Anandwani (Biologist) My qualification is PHD, MSC, MBA, BSC,BMLT,PGDMBT,PGDBT,DMLT If You Like this video please hit the like button comment share subscribe to my channel and press bell icon for notification of new videos. MY CHANNEL GENERALLY UPLOAD VIDEOS OF BIOLOGY SUBJECT FOR BASIC CONCEPT TO HIGHER STANDARD LEVEL FOR NEET AIIMS AND BSC MSC PHD MY CHANNEL IS VERY VALUABLE FOR THOSE WHO IS PREPARING FOR NET SET SLET GATE PHD ENTRANCE IN THE SUBJECT OF BIOLOGICAL SCIENCES.
1. CELL DIVISION Part 1 Introduction Cell Division and Interphase


2. CELL DIVISION PART 2 MITOSIS AND AMITOSIS
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Cell Cycle & Cell Division Class 11th , NEET & AIIMS | Meiosis { PART- 3} by :- Dr. S.K.Singh

like,share & subscribe
Dr.S.K SINGH (MBBS.)





Biology || Cell Division || कोशिका विभाजन Part-1

#DAKSHTAAcademy #cell #celldivision

Meiosis (English) | Cell Cycle & Cell Division (Part 3) | Class 11

Events during Meiosis are explained in very simple student friendly language. The video will help a lot scoring high in School exam and Pre Medical Tests.

Support our channel:
Even a small contribution helps us maintain our channel.

Contact us for purchasing complete syllabus notes : tutorial.concept2012@gmail.com
Class XII (Complete syllabus notes) – Rs. 200
Class XI (Complete syllabus notes) – Rs. 200

Cell Cycle & Cell Division (English)
1 Cell Cycle

2 Mitosis

3 Meiosis

4 Distribution of DNA during Cell Division


Find answers to questions asked in the video:

Answer 1: Yes

Answer 2: No, mutation is the source of variation in these organisms.

Cell Cycle and Cell Division | Biology Class 11

Meiosis: It ensures production of haploid gametes in sexually reproducing organisms where fertilization leads to formation of diploid zygote (the first cell of next generation).

Meiosis I: Two homologous chromosomes of each pair separate from each other and go to separate daughter cells. This reduces the number of chromosomes from diploid (2n) to haploid (n). Therefore meiosis I is also known as reductional division.

Prophase I: It is the longest phase and is divided into 5 sub stages:

· Leptotene

· Zygotene

· Pachytene

· Diplotene

· Diakinesis

Note: A mnemonic in hindi “Lata Zara Paani De Dena”.

Leptotene:

Chromosomes gradually become visible under microscope as slender threads.

Condensation of chromatin fibres continues.

Centrioles move a part.

Spindle begins to develop.

Zygotene: Homologous chromosomes come to lie side by side in pairs, the process is called Synapsis (Figure 10). Pairing is so through that all the corresponding points (genes) lie exactly opposite to each other. A pair of homologous chromosomes lying together is known as bivalent or tetrad. A fibrillar organelle called synaptonemal complex develops between the synapsed homologous chromosomes.

Pachytene:

This stage is characterized by appearance of recombination nodules, the sites at which crossing over occurs between non sisters chromatids of homologous chromosomes.

Crossing over is the exchange of genetic material between two homologous chromosomes. It occurs by breakage and reunion of chromatid segment.

Diplotene:

Dissolution of synaptonemal complex results in separation of homologous chromosomes of bivalents, except at the sites of crossovers. The process of separation of homologous chromosomes is called disjunction.

X-shaped structures so formed are called chiasmata.

Diakinesis:

The chiasmata disappear by sliding towards the tips of chromosomes; the process is called terminalization.

Nucleolus and nuclear membrane disintegrate.

Chromosomes lie free in cytoplasm.

Metaphase I:

Homologous chromosomes lie in two parallel metaphase plates at equator.

Microtubules from the opposite poles of spindle attach to pair of homologous chromosomes.

Anaphase I: The homologous chromosomes separate, while sister chromatids remain associated at their centromeres.

Telophase I:

Nuclear membrane and nucleolus reappear.

Cytokinesis follows.

Interkinesis: A short lived interval between two meiotic divisions.

Significance of meiosis I:

Separates homologous chromosomes so that the number of chromosomes reduces to half.

Introduces variation through crossing over.

At times causes chromosomal mutations by abnormal disjunctions.

Meiosis II: It is equational division because chromosome number remains the same as produced by meiosis I. Thus, meiosis II resembles a normal mitosis.

Prophase II:

Centrioles move apart.

Spindle is laid down between centrioles.

Chromosomes become visible due to condensation.

Nucleoli disappear.

Nuclear membrane disintegrates.

Metaphase II:

Chromosomes align at equator forming single metaphase plate.

Microtubules from opposite poles of spindle get attached to kinetochores of sister chromatids.

Anaphase II:

Centromeres of each chromosomes split.

Chromatids of each chromosome start moving towards opposite poles of the cell.

Telophase II:

Chromosomes become extended.

Spindle is lost.

Nucleoli and nuclear membrane reappears.

Meiosis II is not mitosis:

1. Occurs with haploid number of chromosomes.

2. Not proceeded by interphase.

3. Two chromatids of a chromosome are not similar due to crossing over in meiosis I.

Significance of meiosis:

Maintains specific chromosome number of each species.

Crossing over and random recombination increases genetic variability in population. Variations are very important for the process of evolution.

Concept Tutorial presents ‘Meiosis’ in very simple language to help students in the best possible way.

#CellBiology
#BiologyClass11
#NEET

Cell Division Part 3 in Hindi | कोशिका विभाजन | General Science Biology By Chitrakut Tripathi Sir

In this Video Samanya Gyan Group Pariwar Science Biology and Chemistry Expert Chitrakut Tripathi Sir is teaching about cell scientists, Cell division, Biological Process, Prophase to Cytokinesis in easy language.

विशेष- कोशिका विभाजन, विभाजन की विभिन्न बारीकियां, समसूत्री विभाजन के विभिन्न पद आसान भाषा में, कोशिका-विभाजन वस्तुतः कोशिका चक्र (cell cycle)

(1) असूत्री (Amitosis ) (2) समसूत्री (Mitosis) (3) अर्द्धसूत्री (Meiosis)

आपको सभी टोपिक निशुल्क तैयार करवाये जाएगे जिसके माध्यम से आप सभी Class 8th, 9th, 10th, 11th व 12th तथा सभी Entrance and Govt Jobs Competitive Exam की तैयारी बहुत ही आसानी से कर पाएंगे

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