Meiosis Cell Division Stages — a labelled NEET Biology diagram with a definitions lexicon.
Meiosis Cell Division Stages Labelled parts: Meiosis I, Prophase I, Leptotene, Zygotene, Pachytene, Diplotene, Diakinesis, Synapsis, Bivalent, Crossing over, Chiasma, Terminalization, Meiosis II, Homologous chromosomes separate, Reductions division, Sister chromatids separate, Equational division. The first division of meiosis, where homologous chromosomes separate from each other, reducing the chromosome number by half. FYI: The key event in Meiosis I is the separation of homologous pairs, leading to haploid gametes. The longest and most complex stage of meiosis, characterized by the condensation of chromosomes and the pairing of homologous chromosomes. FYI: Synapsis (pairing of homologous chromosomes) and crossing over (exchange of genetic material) occur during this stage. A pair of homologous chromosomes that are physically associated together during Meiosis I. FYI: The formation of bivalents is a prerequisite for crossing over, which increases genetic variation. The visible site of crossing over, representing the physical point where non-sister chromatids of homologous chromosomes have exchanged segments. FYI: Crossing over at chiasmata is responsible for the exchange of genetic material, leading to recombinant chromosomes. The process by which the ends of chromosomes are protected and maintained, often involving specialized repetitive DNA sequences. FYI: Telomeres are repetitive DNA sequences (e.g., TTAGGG) found at the ends of chromosomes, preventing degradation and fusion. Two identical copies of a chromosome, joined together at the centromere, that are present after DNA replication. They separate during anaphase of mitosis and meiosis II. FYI: Before replication, a chromosome consists of one chromatid; after replication, it consists of two sister chromatids. A type of cell division (Meiosis) that reduces the chromosome number by half, resulting in gametes (haploid cells). FYI: The reduction in chromosome number occurs during Anaphase I, when homologous chromosomes separate.