Topics
Heredity and Evolution
Life Processes in Living Organisms Part -1
- Life Processes in Living Organisms
- Living Organisms and Energy Production
- Glycolysis
- Tricarboxylic Acid Cycle (Citric Acid Cycle or Kreb’s Cycle)
- Phases of Respiration: Electron Transport Chain (Electron Transfer System)
- Production of ATP
- Cellular Respiration
- Energy From Different Food Components
- Cell Division: an Essential Life Process
- Mitosis > Karyokinesis (Division of Nucleus)
- Mitosis > Cytokinesis (Division of Cytoplasm)
- Significance of Mitosis
- Meiosis: Reduction Division
- Stages of Meiosis: Meiosis I
- Stages of Meiosis: Meiosis II
- Significance of Meiosis
- Mitosis Vs Meiosis
Life Processes in Living Organisms Part - 2
Environmental Management
Towards Green Energy
- Energy and Use of Energy
- Generation of Electrical Energy
- Power Plants Based on Nuclear Energy
- Power Plant Based on Thermal Energy
- Power Plants Based on Natural Gas
- Electric Energy Generation and Environment
- Electricity Generation using Hydroelectric Energy
- Electricity Generation using Wind Energy
- Electricity Generation using Solar Energy
- Solar Photovoltaic Cell
- Solar Thermal Power Plant
Animal Classification
- Classification of Living Organisms
- History of Animal Classification
- Traditional Method of Animal Classification
- Conventional System of Animal Classification
- Criteria for New System of Classification > Grades of Organization
- Criteria for New System of Classification > Body Symmetry
- Criteria for New System of Classification > Germ Layers
- Criteria for New System of Classification > Body cavity (Coelom)
- Criteria for New System of Classification > Body Segmentation
- Phylum: Porifera
- Phylum: Cnidaria/Coelenterata
- Phylum: Platyhelminthes
- Phylum: Aschelminthes
- Phylum: Annelida
- Phylum: Arthropoda
- Phylum: Mollusca
- Phylum: Echinodermata
- Phylum: Hemichordata
- Phylum: Chordata
- Subphylum: Urochordata
- Subphylum: Cephalochordata
- Subphylum: Vertebrata/Craniata
- Subphylum: Vertebrata/Craniata > Class: Cyclostomata
- Subphylum: Vertebrata/Craniata > Class: Pisces
- Subphylum: Vertebrata/Craniata > Class: Amphibia
- Subphylum: Vertebrata/Craniata > Class: Reptilia
- Subphylum: Vertebrata/Craniata > Class: Aves
- Subphylum: Vertebrata/Craniata > Class: Mammalia
Introduction to Microbiology
Cell Biology and Biotechnology
- Cell Biology (Cytology)
- Stem Cells
- Stem Cell Research
- Organ Transplantation
- Organ and Body Donation
- Concept of Biotechnology
- Crop Biotechnology > Hybrid Seeds
- Crop Biotechnology > Genetically Modified Organisms (GMOs)
- Crop Biotechnology > Biofertilizers
- Animal Husbandry (Livestock)
- Human Health
- Vaccination and Immunization
- Edible Vaccines
- Treatment
- Interferons
- Gene Therapy
- Cloning
- Industrial Products/White Biotechnology
- Environment and Biotechnology
- Food Biotechnology
- DNA Fingerprinting
- Green Revolution
- White Revolution
- Blue Revolution
- Fertilizers
- Insecticides
- Types of Farming in India > Organic Farming
- Animal Husbandry (Livestock) > Apiculture (Bee Farming)
- Cultivation of Medicinal Plants
- Processing and Preservation of Fruits
Social Health
Disaster Management
Life's Internal Secrets
- Autotrophic Plants
- Heterotrophic Plants
- Human Digestive System
- Nutrition in Plants
- Transport
The Regulators of Life
The Life Cycle
Mapping Our Genes
Understanding Metals and Non-Metals
Striving for Better Environment 2
- Use of Efficient and Eco-friendly Technology
- Sustainable Use of Resources
- Enforcement of Acts, Laws and Policies
Amazing World of Carbon Compounds
Estimated time: 3 minutes
- Key Points: Meiosis I
CBSE: Class 12
Maharashtra State Board: Class 10
Maharashtra State Board: Class 10
Key Points: Meiosis I
- Meiosis I is a reductional division, where the chromosome number reduces from diploid to haploid.
- Prophase I is the longest and most complex stage, divided into five sub-stages: leptotene, zygotene, pachytene, diplotene, and diakinesis.
- In Leptotene, chromosomes become visible and start condensing.
- In Zygotene, homologous chromosomes pair (synapsis), forming bivalents/tetrads with the help of the synaptonemal complex.
- In Pachytene, crossing over occurs between non-sister chromatids, causing genetic recombination.
- In Diplotene and Diakinesis, homologous chromosomes begin to separate; chiasmata appear, chromosomes fully condense, and the nuclear membrane breaks down.
- During Metaphase I, Anaphase I, and Telophase I:
- Chromosomes align at the equator (Metaphase I)
- Homologous chromosomes separate (Anaphase I)
- Two haploid cells (dyads) are formed after Telophase I and cytokinesis
Shaalaa.com | Meiosis I - Introduction
to track your progress
Series: Stages of Meiosis: Meiosis I
0%
