Quick Answer: Which Is The Longest Phase In Prophase 1?

Why is anaphase the shortest phase?

Anaphase is considered the shortest stage of the cell cycle because this stage involves only the separation of sister chromatids and their migration….

What are the stages of prophase?

Prophase I is divided into five phases: leptotene, zygotene, pachytene, diplotene, and diakinesis.

What does prophase 2 look like?

Meiosis II begins without any further replication of the chromosomes. In prophase II, the nuclear envelope breaks down and the spindle apparatus forms. The nuclear envelope breaks down, and the spindle apparatus forms. …

Which of the following is longest sub phase of meiosis 1?

Prophase I is the longest phase of meiosis. It occurs in five stages. They are Leptotene, Zygotene, Pachytene, Diplotene and Diakinesis.

Why is prophase the longest phase?

Cells spend about 14 percent of the cell cycle in prophase. This is the next largest amount of time spent in a phase after interphase. This phase takes longer than the others because the nuclear envelope fragments and the microtubules have to attach to the chromosomes.

What is the definition of prophase 1?

1 : the initial stage of mitosis and of the mitotic division of meiosis characterized by the condensation of chromosomes consisting of two chromatids, disappearance of the nucleolus and nuclear membrane, and formation of mitotic spindle.

What is the difference of prophase 1 and 2?

1 Answer. Mandira P. Prophase I of meiosis is a very elaborate phase subdivided in leptotene, zygotene, pachytene, diplotene and diakinesis. Prophase II is less eventful, similar to mitotic prophase.

How do you describe prophase?

During prophase in mitosis, the nuclear membrane breaks down and chromatin condenses. During prophase one of meiosis, the chromosomes group together and crossing over occurs. During prophase two, the chromosomes condense and are attached to spindle fibers where they can be moved.

How many cells are in prophase?

Onion Root Tips MitosisInterphaseProphaseNumber of cells2010Percent of cells55.6%27.8%Jan 9, 2012

What happen in prophase 1?

During prophase I, they coil and become shorter and thicker and visible under the light microscope. The duplicated homologous chromosomes pair, and crossing-over (the physical exchange of chromosome parts) occurs. … The nuclear envelope disappears at the end of prophase I, allowing the spindle to enter the nucleus.

What does metaphase 1 look like?

To see metaphase I animated, click the Play button. The centrioles are at opposite poles of the cell. The pairs of homologous chromosomes (the bivalents), now as tightly coiled and condensed as they will be in meiosis, become arranged on a plane equidistant from the poles called the metaphase plate.

Which stage of prophase is lengthy?

This complex extends the length of the chromosome pair and is attached to the nuclear envelope. Third Stage: This is one of the longest stages of Prophase I, and it is during this stage that biological information is exchanged between chromosome pairs.

What is the importance of prophase 1?

Prophase is the firs Spindle fibres begin to form as well as centrioles. Prophase is important because this is when chromatin becomes chromosomes so the right number of chromosomes can be distributed equally to each daughter cell produced.

What happens during prophase?

During prophase, the complex of DNA and proteins contained in the nucleus, known as chromatin, condenses. The chromatin coils and becomes increasingly compact, resulting in the formation of visible chromosomes.

What is an example of prophase?

Before prophase begins, the chromosomes duplicate to form two long, thin strands called chromatids. During prophase itself, the chromatids condense and thicken to form distinct bodies. … For example, human beings have 23 pairs of chromosomes in all somatic cells, or 46 chromosomes in total.

Which phase is longest?

InterphaseStages of Interphase During interphase, the cell undergoes normal growth processes while also preparing for cell division. It is the longest phase of the cell cycle, cell spends approximately 90% of its time in this phase.

Which mitotic phase takes longest?

prophaseThe first and longest phase of mitosis is prophase. During prophase, chromatin condenses into chromosomes, and the nuclear envelope (the membrane surrounding the nucleus) breaks down. In animal cells, the centrioles near the nucleus begin to separate and move to opposite poles of the cell.

What are the five stages of prophase 1?

Prophase 1 of Meiosis is the first stage of meiosis and is defined by five different phases; Leptotene, Zygotene, Pachytene, Diplotene and Diakinesis (in that order).