These are visible under a microscope because of chromosomal condensation. The paired homologous chromosomes in synapses are known as bivalents, and it is now clear that genetic recombination is what causes chiasmata to occur. Each of these phases is designated as I or II depending on where it occurs, i.e. These are prophase, metaphase, anaphase, and telophase. There are two successive nuclear divisions: meiosis I and meiosis II.Įach of them has four major phases. Meiosis is a specialized form of cell division that ultimately gives rise to non-identical haploid gametes (or haploid sex cells). Prophase I precedes metaphase I, a stage that features homologous chromosomes aligning along a single plane in the center of the cell.īefore we move on and become acquainted with the various substages of prophase I, let us first understand some basic concepts. This stage then ends with the disintegration of the nucleolus and the nuclear membrane. Thus, this stage is important to increase genetic variation. Prophase I highlights the exchange of DNA between paired chromosomes via a process called homologous recombination and the crossover at chiasmata (singular: chiasma) between non-sister chromatids. This stage is characterized by five stages, namely leptotene, zygotene, pachytene, diplotene, and diakinesis, that make it up. Prophase I is the first stage of meiosis I. Let’s read on to find answers to what is prophase 1, what happens in prophase 1, and what is the importance of prophase 1. This includes prophase, which consists of prophase 1 (for meiosis 1) and prophase 2 (for meiosis 2). The stages of meiosis 1 (or meiosis I) are named after the first process and the same occurs for meiosis 2 ( meiosis II).
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |