159 public questions tagged with this topic.
During zygotene, homologous chromosomes start pairing, a process called synapsis, forming bivalents. This follows from NCERT principle where relation explains outcome clearly for students.
Ref: NCERT Biology Textbook for Class XI and XII (Botany section), Chapter: Biology - Botany portion covering relevant concept, Topic: Plant structure, physiology and applications.
Meiosis produces genetically varied lls due to crossing over and independent assortment, not identical ones. This follows from NCERT principle where relation explains outcome clearly for students.
Ref: NCERT Biology Textbook for Class XI and XII (Botany section), Chapter: Biology - Botany portion covering relevant concept, Topic: Plant structure, physiology and applications.
Recombinase facilitates crossing over during the pachytene stage of prophase I in meiosis. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.
Ref: NCERT Biology Textbook for Class XI and XII (Botany section), Chapter: Morphology and Anatomy of Flowering Plants, Topic: Plant structure and tissue systems.
Crossing over occurs in the pachytene stage, not in zygotene. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.
Ref: NCERT Biology Textbook for Class XI and XII (Botany section), Chapter: Morphology and Anatomy of Flowering Plants, Topic: Plant structure and tissue systems.
Chromosomes condense during prophase I of meiosis. This follows from NCERT principle where relation explains outcome clearly for students.
Ref: NCERT Biology Textbook for Class XI and XII (Botany section), Chapter: Biology - Botany portion covering relevant concept, Topic: Plant structure, physiology and applications.
During telophase II, chromosomes decondense, and nuclear membranes reform. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.
Ref: NCERT Biology Textbook for Class XI and XII (Botany section), Chapter: Morphology and Anatomy of Flowering Plants, Topic: Plant structure and tissue systems.
During Prophase I, homologous chromosomes undergo crossing over, increasing genetic diversity. This follows from NCERT principle where relation explains outcome clearly for students.
Ref: NCERT Biology Textbook for Class XI and XII (Botany section), Chapter: Biology - Botany portion covering relevant concept, Topic: Plant structure, physiology and applications.
Crossing over occurs during prophase I of meiosis, allowing genetic recombination between homologous chromosomes. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.
Ref: NCERT Biology Textbook for Class XI and XII (Botany section), Chapter: Morphology and Anatomy of Flowering Plants, Topic: Plant structure and tissue systems.
Crossing over occurs during meiosis and allows genetic recombination between homologous chromosomes. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.
Ref: NCERT Biology Textbook for Class XI and XII (Botany section), Chapter: Morphology and Anatomy of Flowering Plants, Topic: Plant structure and tissue systems.
Meiosis II is similar to mitosis and is responsible for the separation of sister chromatids into different lls. This follows from NCERT principle where relation explains outcome clearly for students.
Ref: NCERT Biology Textbook for Class XI and XII (Botany section), Chapter: Biology - Botany portion covering relevant concept, Topic: Plant structure, physiology and applications.
Meiosis results in the formation of four genetically distinct haploid lls. This follows from latest NCERT 2026-27 principle explaining the concept clearly for NEET students in simple steps as per rationalized syllabus.
Ref: NCERT Biology Textbook - Latest Edition for Academic Session 2026-27 (Botany section, Rationalized Textbook for Class XI and XII), Chapter: Biology - Botany portion (Latest NCERT Textbooks for Academic Session 2026-27 -
Mammalian oocytes enter meiosis during embryonic life and become arrested in diplotene of prophase I within primordial follicles, known as dictyate stage with intact germinal vesicle nucleus and homologous chromosomes held by chiasmata. High intra-oocyte cAMP maintained by cumulus-derived signals and phosphodiesterase inhibition sustains arrest by preventing MPF activation. At birth ovaries contain approximately one million follicles dormant in this state lasting until puberty when LH surges trigger meiotic resumption. Arrest permits extensive growth, accumulation of maternal transcripts, organelles essential for early embryogenesis, zygotic reprogramming, developmental competence and embryonic viability.
Ref: Alberts, Molecular Biology of the Cell, Chapter 21: Oocyte arrest in prophase I dictyate stage until LH surge.
