SlideShare a Scribd company logo
TYPES OF CROSSING OVER
AND
MECHANISM OF MEIOTIC
CROSSING OVER
SONIA
M.PHIL 2021
LUMHS JAMSHORO
Meiotic Crossing Over
 This Type of crossing over takes place in germinal cells
during gametogenesis OR Formation of gametes
The major steps in meiotic
crossing over are:
I) Synapsis
Pairing between the two homologues chromosomes
II) Duplication of chromosomes
Synapsis is followed by duplication of chromosomes
III) Crossing over
Exchange of segment between non sister chromatids
IV) Terminalisation
After crossing over the non sister chromatids starts to repel each other.
Chiasma itself moves in zipper fashion towards the end of tetrad.
CROSSING-OVER
The physical exchange of parts of non-sister
chromatids of homologous chromosomes
following synapsis at meiosis is known as
crossing-over.
Results in the recombination of genes.
1,or 2, or more fragments may be interchanged
during crossing-over.
1. SINGLE CROSSING-OVER
 Only one chromatid of each chromosome is
involved in single crossing over.
Single crossing over is of most frequent
occurrence.
2. DOUBLE CROSSING-OVER
Both the chiasmata may be between the same
chromatids or between different chromatids.
Two, or three, or all the four chromatids of the
homologous pairs of chromosomes are involved
in the process of double crossing-over.
Double cross-over gametes are produced.
This is of less frequent occurrence.
3. MULTIPLE CROSSING-OVER
More than two chiasmata are formed.
Corresponding to the number of chiasmata
formed, it is called triple (3 chiasmata),
quadruple (4 chiasmata), and so on.
Multiple crossing-over does not occur frequently.
THANK YOU

More Related Content

Similar to LINKAGE-AND-CROSSING-OVER-8.ppt

Crossing over and Recombination in Meiosos.pdf
Crossing over and Recombination in Meiosos.pdfCrossing over and Recombination in Meiosos.pdf
Crossing over and Recombination in Meiosos.pdf
SamonteKim
 
Meiosis
MeiosisMeiosis
Meiosis
Salman Taunoy
 
linkage-and-crossing-over presentation ppt
linkage-and-crossing-over presentation pptlinkage-and-crossing-over presentation ppt
linkage-and-crossing-over presentation ppt
vanyaatomar
 
Presentation on Meiosis
Presentation on MeiosisPresentation on Meiosis
Presentation on Meiosis
Dr. Kaushik Kumar Panigrahi
 
Meiosis, Crossing Over
Meiosis, Crossing OverMeiosis, Crossing Over
Meiosis, Crossing Over
Amit Sahoo
 
Cell division – meiosis
Cell division – meiosisCell division – meiosis
Cell division – meiosis
Anna Purna
 
Meiosis.ppt..
Meiosis.ppt..Meiosis.ppt..
Meiosis.ppt..
Aashish Patel
 
meiosis division
meiosis divisionmeiosis division
meiosis division
SoniaBajaj10
 
BiologyExchange.co.uk Shared Resource
BiologyExchange.co.uk Shared ResourceBiologyExchange.co.uk Shared Resource
BiologyExchange.co.uk Shared Resource
biologyexchange
 
Meiosis
MeiosisMeiosis
meoisis 1 or 2
meoisis  1 or 2meoisis  1 or 2
meoisis 1 or 2
shahroze123
 
Meiosis Lesson
Meiosis LessonMeiosis Lesson
Crossing over
Crossing overCrossing over
Crossing over
vaishalidandge3
 
MEIOSIS.ppt notes on meiosis that occurs in human
MEIOSIS.ppt notes on meiosis that occurs in humanMEIOSIS.ppt notes on meiosis that occurs in human
MEIOSIS.ppt notes on meiosis that occurs in human
michaelkingtz01
 
Lect 3 meiosis
Lect 3 meiosisLect 3 meiosis
Lect 3 meiosis
Hidayatul Illah
 
Lect 3 meiosis
Lect 3 meiosisLect 3 meiosis
Lect 3 meiosis
syaheer77
 
Mieosis 11th
Mieosis 11thMieosis 11th
Mieosis 11th
Jitesh Daunde
 
CROSSING OVER
CROSSING OVERCROSSING OVER
CROSSING OVER
JANANI M
 
Cell division meosis-
Cell division meosis-Cell division meosis-
Cell division meosis-
Dr. Priti D. Diwan
 
LINKAGE AND CROSSING OVER
LINKAGE AND CROSSING OVERLINKAGE AND CROSSING OVER
LINKAGE AND CROSSING OVER
Bilal1637998
 

Similar to LINKAGE-AND-CROSSING-OVER-8.ppt (20)

Crossing over and Recombination in Meiosos.pdf
Crossing over and Recombination in Meiosos.pdfCrossing over and Recombination in Meiosos.pdf
Crossing over and Recombination in Meiosos.pdf
 
Meiosis
MeiosisMeiosis
Meiosis
 
linkage-and-crossing-over presentation ppt
linkage-and-crossing-over presentation pptlinkage-and-crossing-over presentation ppt
linkage-and-crossing-over presentation ppt
 
Presentation on Meiosis
Presentation on MeiosisPresentation on Meiosis
Presentation on Meiosis
 
Meiosis, Crossing Over
Meiosis, Crossing OverMeiosis, Crossing Over
Meiosis, Crossing Over
 
Cell division – meiosis
Cell division – meiosisCell division – meiosis
Cell division – meiosis
 
Meiosis.ppt..
Meiosis.ppt..Meiosis.ppt..
Meiosis.ppt..
 
meiosis division
meiosis divisionmeiosis division
meiosis division
 
BiologyExchange.co.uk Shared Resource
BiologyExchange.co.uk Shared ResourceBiologyExchange.co.uk Shared Resource
BiologyExchange.co.uk Shared Resource
 
Meiosis
MeiosisMeiosis
Meiosis
 
meoisis 1 or 2
meoisis  1 or 2meoisis  1 or 2
meoisis 1 or 2
 
Meiosis Lesson
Meiosis LessonMeiosis Lesson
Meiosis Lesson
 
Crossing over
Crossing overCrossing over
Crossing over
 
MEIOSIS.ppt notes on meiosis that occurs in human
MEIOSIS.ppt notes on meiosis that occurs in humanMEIOSIS.ppt notes on meiosis that occurs in human
MEIOSIS.ppt notes on meiosis that occurs in human
 
Lect 3 meiosis
Lect 3 meiosisLect 3 meiosis
Lect 3 meiosis
 
Lect 3 meiosis
Lect 3 meiosisLect 3 meiosis
Lect 3 meiosis
 
Mieosis 11th
Mieosis 11thMieosis 11th
Mieosis 11th
 
CROSSING OVER
CROSSING OVERCROSSING OVER
CROSSING OVER
 
Cell division meosis-
Cell division meosis-Cell division meosis-
Cell division meosis-
 
LINKAGE AND CROSSING OVER
LINKAGE AND CROSSING OVERLINKAGE AND CROSSING OVER
LINKAGE AND CROSSING OVER
 

Recently uploaded

ISO/IEC 27001, ISO/IEC 42001, and GDPR: Best Practices for Implementation and...
ISO/IEC 27001, ISO/IEC 42001, and GDPR: Best Practices for Implementation and...ISO/IEC 27001, ISO/IEC 42001, and GDPR: Best Practices for Implementation and...
ISO/IEC 27001, ISO/IEC 42001, and GDPR: Best Practices for Implementation and...
PECB
 
Hindi varnamala | hindi alphabet PPT.pdf
Hindi varnamala | hindi alphabet PPT.pdfHindi varnamala | hindi alphabet PPT.pdf
Hindi varnamala | hindi alphabet PPT.pdf
Dr. Mulla Adam Ali
 
Natural birth techniques - Mrs.Akanksha Trivedi Rama University
Natural birth techniques - Mrs.Akanksha Trivedi Rama UniversityNatural birth techniques - Mrs.Akanksha Trivedi Rama University
Natural birth techniques - Mrs.Akanksha Trivedi Rama University
Akanksha trivedi rama nursing college kanpur.
 
Life upper-Intermediate B2 Workbook for student
Life upper-Intermediate B2 Workbook for studentLife upper-Intermediate B2 Workbook for student
Life upper-Intermediate B2 Workbook for student
NgcHiNguyn25
 
Présentationvvvvvvvvvvvvvvvvvvvvvvvvvvvv2.pptx
Présentationvvvvvvvvvvvvvvvvvvvvvvvvvvvv2.pptxPrésentationvvvvvvvvvvvvvvvvvvvvvvvvvvvv2.pptx
Présentationvvvvvvvvvvvvvvvvvvvvvvvvvvvv2.pptx
siemaillard
 
RHEOLOGY Physical pharmaceutics-II notes for B.pharm 4th sem students
RHEOLOGY Physical pharmaceutics-II notes for B.pharm 4th sem studentsRHEOLOGY Physical pharmaceutics-II notes for B.pharm 4th sem students
RHEOLOGY Physical pharmaceutics-II notes for B.pharm 4th sem students
Himanshu Rai
 
Pengantar Penggunaan Flutter - Dart programming language1.pptx
Pengantar Penggunaan Flutter - Dart programming language1.pptxPengantar Penggunaan Flutter - Dart programming language1.pptx
Pengantar Penggunaan Flutter - Dart programming language1.pptx
Fajar Baskoro
 
PIMS Job Advertisement 2024.pdf Islamabad
PIMS Job Advertisement 2024.pdf IslamabadPIMS Job Advertisement 2024.pdf Islamabad
PIMS Job Advertisement 2024.pdf Islamabad
AyyanKhan40
 
C1 Rubenstein AP HuG xxxxxxxxxxxxxx.pptx
C1 Rubenstein AP HuG xxxxxxxxxxxxxx.pptxC1 Rubenstein AP HuG xxxxxxxxxxxxxx.pptx
C1 Rubenstein AP HuG xxxxxxxxxxxxxx.pptx
mulvey2
 
What is Digital Literacy? A guest blog from Andy McLaughlin, University of Ab...
What is Digital Literacy? A guest blog from Andy McLaughlin, University of Ab...What is Digital Literacy? A guest blog from Andy McLaughlin, University of Ab...
What is Digital Literacy? A guest blog from Andy McLaughlin, University of Ab...
GeorgeMilliken2
 
Exploiting Artificial Intelligence for Empowering Researchers and Faculty, In...
Exploiting Artificial Intelligence for Empowering Researchers and Faculty, In...Exploiting Artificial Intelligence for Empowering Researchers and Faculty, In...
Exploiting Artificial Intelligence for Empowering Researchers and Faculty, In...
Dr. Vinod Kumar Kanvaria
 
LAND USE LAND COVER AND NDVI OF MIRZAPUR DISTRICT, UP
LAND USE LAND COVER AND NDVI OF MIRZAPUR DISTRICT, UPLAND USE LAND COVER AND NDVI OF MIRZAPUR DISTRICT, UP
LAND USE LAND COVER AND NDVI OF MIRZAPUR DISTRICT, UP
RAHUL
 
Wound healing PPT
Wound healing PPTWound healing PPT
Wound healing PPT
Jyoti Chand
 
বাংলাদেশ অর্থনৈতিক সমীক্ষা (Economic Review) ২০২৪ UJS App.pdf
বাংলাদেশ অর্থনৈতিক সমীক্ষা (Economic Review) ২০২৪ UJS App.pdfবাংলাদেশ অর্থনৈতিক সমীক্ষা (Economic Review) ২০২৪ UJS App.pdf
বাংলাদেশ অর্থনৈতিক সমীক্ষা (Economic Review) ২০২৪ UJS App.pdf
eBook.com.bd (প্রয়োজনীয় বাংলা বই)
 
BBR 2024 Summer Sessions Interview Training
BBR  2024 Summer Sessions Interview TrainingBBR  2024 Summer Sessions Interview Training
BBR 2024 Summer Sessions Interview Training
Katrina Pritchard
 
Reimagining Your Library Space: How to Increase the Vibes in Your Library No ...
Reimagining Your Library Space: How to Increase the Vibes in Your Library No ...Reimagining Your Library Space: How to Increase the Vibes in Your Library No ...
Reimagining Your Library Space: How to Increase the Vibes in Your Library No ...
Diana Rendina
 
The basics of sentences session 6pptx.pptx
The basics of sentences session 6pptx.pptxThe basics of sentences session 6pptx.pptx
The basics of sentences session 6pptx.pptx
heathfieldcps1
 
How to Add Chatter in the odoo 17 ERP Module
How to Add Chatter in the odoo 17 ERP ModuleHow to Add Chatter in the odoo 17 ERP Module
How to Add Chatter in the odoo 17 ERP Module
Celine George
 
How to Setup Warehouse & Location in Odoo 17 Inventory
How to Setup Warehouse & Location in Odoo 17 InventoryHow to Setup Warehouse & Location in Odoo 17 Inventory
How to Setup Warehouse & Location in Odoo 17 Inventory
Celine George
 
MARY JANE WILSON, A “BOA MÃE” .
MARY JANE WILSON, A “BOA MÃE”           .MARY JANE WILSON, A “BOA MÃE”           .
MARY JANE WILSON, A “BOA MÃE” .
Colégio Santa Teresinha
 

Recently uploaded (20)

ISO/IEC 27001, ISO/IEC 42001, and GDPR: Best Practices for Implementation and...
ISO/IEC 27001, ISO/IEC 42001, and GDPR: Best Practices for Implementation and...ISO/IEC 27001, ISO/IEC 42001, and GDPR: Best Practices for Implementation and...
ISO/IEC 27001, ISO/IEC 42001, and GDPR: Best Practices for Implementation and...
 
Hindi varnamala | hindi alphabet PPT.pdf
Hindi varnamala | hindi alphabet PPT.pdfHindi varnamala | hindi alphabet PPT.pdf
Hindi varnamala | hindi alphabet PPT.pdf
 
Natural birth techniques - Mrs.Akanksha Trivedi Rama University
Natural birth techniques - Mrs.Akanksha Trivedi Rama UniversityNatural birth techniques - Mrs.Akanksha Trivedi Rama University
Natural birth techniques - Mrs.Akanksha Trivedi Rama University
 
Life upper-Intermediate B2 Workbook for student
Life upper-Intermediate B2 Workbook for studentLife upper-Intermediate B2 Workbook for student
Life upper-Intermediate B2 Workbook for student
 
Présentationvvvvvvvvvvvvvvvvvvvvvvvvvvvv2.pptx
Présentationvvvvvvvvvvvvvvvvvvvvvvvvvvvv2.pptxPrésentationvvvvvvvvvvvvvvvvvvvvvvvvvvvv2.pptx
Présentationvvvvvvvvvvvvvvvvvvvvvvvvvvvv2.pptx
 
RHEOLOGY Physical pharmaceutics-II notes for B.pharm 4th sem students
RHEOLOGY Physical pharmaceutics-II notes for B.pharm 4th sem studentsRHEOLOGY Physical pharmaceutics-II notes for B.pharm 4th sem students
RHEOLOGY Physical pharmaceutics-II notes for B.pharm 4th sem students
 
Pengantar Penggunaan Flutter - Dart programming language1.pptx
Pengantar Penggunaan Flutter - Dart programming language1.pptxPengantar Penggunaan Flutter - Dart programming language1.pptx
Pengantar Penggunaan Flutter - Dart programming language1.pptx
 
PIMS Job Advertisement 2024.pdf Islamabad
PIMS Job Advertisement 2024.pdf IslamabadPIMS Job Advertisement 2024.pdf Islamabad
PIMS Job Advertisement 2024.pdf Islamabad
 
C1 Rubenstein AP HuG xxxxxxxxxxxxxx.pptx
C1 Rubenstein AP HuG xxxxxxxxxxxxxx.pptxC1 Rubenstein AP HuG xxxxxxxxxxxxxx.pptx
C1 Rubenstein AP HuG xxxxxxxxxxxxxx.pptx
 
What is Digital Literacy? A guest blog from Andy McLaughlin, University of Ab...
What is Digital Literacy? A guest blog from Andy McLaughlin, University of Ab...What is Digital Literacy? A guest blog from Andy McLaughlin, University of Ab...
What is Digital Literacy? A guest blog from Andy McLaughlin, University of Ab...
 
Exploiting Artificial Intelligence for Empowering Researchers and Faculty, In...
Exploiting Artificial Intelligence for Empowering Researchers and Faculty, In...Exploiting Artificial Intelligence for Empowering Researchers and Faculty, In...
Exploiting Artificial Intelligence for Empowering Researchers and Faculty, In...
 
LAND USE LAND COVER AND NDVI OF MIRZAPUR DISTRICT, UP
LAND USE LAND COVER AND NDVI OF MIRZAPUR DISTRICT, UPLAND USE LAND COVER AND NDVI OF MIRZAPUR DISTRICT, UP
LAND USE LAND COVER AND NDVI OF MIRZAPUR DISTRICT, UP
 
Wound healing PPT
Wound healing PPTWound healing PPT
Wound healing PPT
 
বাংলাদেশ অর্থনৈতিক সমীক্ষা (Economic Review) ২০২৪ UJS App.pdf
বাংলাদেশ অর্থনৈতিক সমীক্ষা (Economic Review) ২০২৪ UJS App.pdfবাংলাদেশ অর্থনৈতিক সমীক্ষা (Economic Review) ২০২৪ UJS App.pdf
বাংলাদেশ অর্থনৈতিক সমীক্ষা (Economic Review) ২০২৪ UJS App.pdf
 
BBR 2024 Summer Sessions Interview Training
BBR  2024 Summer Sessions Interview TrainingBBR  2024 Summer Sessions Interview Training
BBR 2024 Summer Sessions Interview Training
 
Reimagining Your Library Space: How to Increase the Vibes in Your Library No ...
Reimagining Your Library Space: How to Increase the Vibes in Your Library No ...Reimagining Your Library Space: How to Increase the Vibes in Your Library No ...
Reimagining Your Library Space: How to Increase the Vibes in Your Library No ...
 
The basics of sentences session 6pptx.pptx
The basics of sentences session 6pptx.pptxThe basics of sentences session 6pptx.pptx
The basics of sentences session 6pptx.pptx
 
How to Add Chatter in the odoo 17 ERP Module
How to Add Chatter in the odoo 17 ERP ModuleHow to Add Chatter in the odoo 17 ERP Module
How to Add Chatter in the odoo 17 ERP Module
 
How to Setup Warehouse & Location in Odoo 17 Inventory
How to Setup Warehouse & Location in Odoo 17 InventoryHow to Setup Warehouse & Location in Odoo 17 Inventory
How to Setup Warehouse & Location in Odoo 17 Inventory
 
MARY JANE WILSON, A “BOA MÃE” .
MARY JANE WILSON, A “BOA MÃE”           .MARY JANE WILSON, A “BOA MÃE”           .
MARY JANE WILSON, A “BOA MÃE” .
 

LINKAGE-AND-CROSSING-OVER-8.ppt

  • 1. TYPES OF CROSSING OVER AND MECHANISM OF MEIOTIC CROSSING OVER SONIA M.PHIL 2021 LUMHS JAMSHORO
  • 2. Meiotic Crossing Over  This Type of crossing over takes place in germinal cells during gametogenesis OR Formation of gametes
  • 3. The major steps in meiotic crossing over are: I) Synapsis Pairing between the two homologues chromosomes II) Duplication of chromosomes Synapsis is followed by duplication of chromosomes III) Crossing over Exchange of segment between non sister chromatids IV) Terminalisation After crossing over the non sister chromatids starts to repel each other. Chiasma itself moves in zipper fashion towards the end of tetrad.
  • 4. CROSSING-OVER The physical exchange of parts of non-sister chromatids of homologous chromosomes following synapsis at meiosis is known as crossing-over. Results in the recombination of genes. 1,or 2, or more fragments may be interchanged during crossing-over.
  • 5.
  • 6. 1. SINGLE CROSSING-OVER  Only one chromatid of each chromosome is involved in single crossing over. Single crossing over is of most frequent occurrence.
  • 7. 2. DOUBLE CROSSING-OVER Both the chiasmata may be between the same chromatids or between different chromatids. Two, or three, or all the four chromatids of the homologous pairs of chromosomes are involved in the process of double crossing-over. Double cross-over gametes are produced. This is of less frequent occurrence.
  • 8.
  • 9. 3. MULTIPLE CROSSING-OVER More than two chiasmata are formed. Corresponding to the number of chiasmata formed, it is called triple (3 chiasmata), quadruple (4 chiasmata), and so on. Multiple crossing-over does not occur frequently.
  • 10.