![]() ![]() Meiotic prophase I is subdivided into five stages: leptotene, zygotene, pachytene, diplotene, and diakinesis. During this phase, the chromosomes inside the cell’s nucleus condense and form tight structures. Why is prophase important in mitosis?įigure 1: During prophase, the chromosomes in a cell’s nucleus condense to the point that they can be viewed using a light microscope. This is where chromosomes exchange sections of DNA. During prophase I homologous chromosomes make contacts with each other called chiasmata and “crossing over” occurs. ![]() Meiotic prophase I is much longer that mitotic prophase. How is prophase 1 of meiosis different from prophase of mitosis?Ĭhromosomes condense and the centrosomes begin to form an early spindle. The significance of meiosis is, – It is responsible for formation of sex cells which are responsible for sexual reproduction. What is the significance of meiosis by Vedantu?Ĭomplete Answer: Meiosis process is characterised by the presence of a specialised cell called the germ cell which undergoes a split to form four different sex cells. Together, they provide the cellular basis for healthy growth and sexual reproduction. Meiosis makes the cells needed for sexual reproduction to occur, and mitosis replicates non-sex cells needed for growth and development. What is the significance of mitosis meiosis? This arrangement means that each chromosome has the shape of an X. Because each chromosome was duplicated during the S phase that occurred just before prophase I, each now consists of two sister chromatids joined at the centromere. Which important event in meiosis occurs during prophase 1 point?ĭuring prophase I, the chromosomes condense and become visible inside the nucleus. Replicated chromosomes become condensed and visible. There are two stages of prophase: Replicated centrioles begin to move towards the pole of the cell. What are the two significant events happening in prophase I? This recombines the alleles present on each chromosome, as seen in the image below. When the homologous chromosomes pair up, portions of the DNA on different chromosomes are able to swap. However, the homologous chromosomes also pair in prophase I. What happens in prophase 1 of mitosis?ĭuring prophase I, the chromosomes condense, as in mitosis. It maintains the constant number of chromosomes by halving the same. It activates the genetic information for the development of sex cells and deactivates the sporophytic information. Meiosis is responsible for the formation of sex cells or gametes that are responsible for sexual reproduction. It results in recombinant homologous chromosomes. Crossing over is the exchange of genetic material between two homologous chromosomes with the help of enzyme recombinase. Crossing is mainly responsible for the genetic difference. What is the important event of prophase 1?Ĭrossing over is one of the most important events that takes place during prophase 1. Chromosomal condensation allows these to be viewed in the microscope. The paired chromosomes are called bivalents, and the formation of chiasmata caused by genetic recombination becomes apparent. During prophase I, homologous chromosomes pair and form synapses, a step unique to meiosis. ![]()
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