Hi, Joe Bob’s here. I’m pretty sure I last left you in the study of mitosis. Mitosis is very similar to our study today, Meiosis. Now, In Meiosis there is only one more phase for each stage of Meiosis, then Mitosis.
Let’s see where I’m heading first in my Magical Meiosis journey. Let Maryann tell you about the back round of Meiosis. “Well, Joe Bob! As you and me both know, Meiosis is used for producing Gametes and sex cells. Gametes are basically sex cells; egg cells are gametes, and sperm cells as well, when they meet up, there is fertilization happening.
In which the female gametes, and the male gametes come together and produce. Meiosis has two divisions, which is why; there is two of Prophase, two of Metaphase, and so… on. Also, in your journey you will come to find out that, the Meiosis process is a lot longer then Mitosis”Now Joe Bob, off with your journey.” As I say goodbye to Maryann, whom was very helpful.
I run in to Interphase, the first phase in Meiosis. “Hi Joe.” Says the phase. “Hello” I say. “What brings you to area?” he asked.
“Well, I was just wondering if you could explain to me, what does do on in this phase?” I asked. “Well, that’s easy.”First, the cell replicates it’s chromosomes, and is left with two sister chromatids which are held together by a Centromere.” Says Interphase. “But move on to Prophase 1 to find out much more.” He continues. As I follow the path down to Prophase 1.
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?The cell cycle, or cell-division cycle, is the series of events that take place in a cell leading to its division and duplication that produces two daughter cells. In cells without a nucleus, the cell cycle occurs via a process termed binary fission. In cells with a nucleus, the cell cycle can be divided in three periods: interphase—during which the cell grows, accumulating nutrients needed for ...
I saw the chromosomes double up and then combine again. I notice that this didn’t happen in Mitosis. I hurried along to Prophase 1 to ask what was with this abnormal behavior. “Why were all the chromosomes combining twice?” I asked. “Well, in this division, the chromosomes, pair up in 2 homologous chromosomes, each made up of two sister chromatids, and this is called a tetrad.” Prophase explains to me. “Okay, well then what is this process called?” I ask.
” This process is what we call synapsis.” Prophase 1 explains. “Alright… Wait, what are they doing now? “I exclaim. “Ohh… that is crossing over.” He tells me.
“Ohh… I see, the genetic material is being moved to different locations. But what does that do for the cell?” I ask. “It is simple, crossing over, as we call it, is just the exchanging of genetic material, it gives the cell genetic variation.”That is why you have your purple hair, and those big blue eyes of yours, this is where it all happens.”In Prophase 1.” Prophase 1 concludes. “Thanks fro that information.” I answer. I move along the equator to metaphase.
Bad idea, I think I should take a different route. All the chromosomes are attaching to the equator, now I know I’m in Metaphase. “Hello” says metaphase. “Hi” I say. “Well, you are Metaphase 1, the chromosomes become attached with to a spindle fiber.” Metaphase 1 says. “Also, it’s unique that the homologous chromosomes line up side by side, instead of on opposite sides of the equator.” Metaphase says.
“Well that’s great, to hear.” I finish. As my journey continues on. I feel a rumble. The chromosomes are separating.
I must be in Anaphase. “Hello Anaphase.” I say. “Looks like your phase is right up to par.” I say. “Yes, It’s looking great.” Anaphase tells me. ” Well, what is going on here?” I ask. “Well, just what you saw, the chromosomes are separating, and the spindle fibers are pulling them apart.” Anaphase says to me.
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Human beings obtain their physical traits clearly through heredity. A nice boy gets the delicate shape of his nose from his mother. However, the question is, "Where does this 'nice' boy get his 'nice' trait from?" In the battle of 'Nature versus Nurture' in shaping an individual's personality, nurture wins. Heredity is not the key factor in contributing to our personality. "People with high self- ...
“This step insures that each new cell receives a different chromosome from each pair.” Anaphase tells me. ” Okay, when do they spilt into, separate cells?” I ask “Well, in the next step, Telophase.” Anaphase tells me. I continue to the road ahead. I see the cleavage furrow coming in on me. “Wow, it’s really moving.” I say, ” yes it is.” Telophase says.” So what exactly happens here is it very complicated, or what?” I ask.
“It so happens that, a lot of things happen here.”If you remember, what happened in Prophase 1, then reverse that, and you get this.” Telophase says. “Ohh… so the spindle fiber is broken first? And then the chromosomes are uncoiled, and go to nowhere.” A say. “NO… they go to two separate cells.” Telophase corrects me. ” Then…
.” I ask. “Well, the cells genetic material transmitted at this point. And, the genetic material is spilt into the two cells.” Telophase says. “But how much genetic material is left after all that movement?” I ask.
“Exactly half, because, the material moved in the cells are form a pair of chromosomes, so when they move out from the main cell, there is only half, as they enter the two new cells.” Telophase answers. “Okay… well I guess, we are done and out of here, so long for… .”What… .” Telophase stops me.
“What, isn’t the process done?” I ask. “No, you still have each a hole other division to go though.” Telophase says. “But why, why is there, a whole other division?” I ask in confusion. “It’s simply this, the chromosomes are still doubled, consisting of two sister chromosomes.” Telophase tells me. “I see, well I’ll just ask each phase, what it does.” I say, “That won’t work Joe.” Telophase tells me. “Why not?” I ask, “Because you, have to learn your self what is happening.” Telophase tells me.
AP Biology Meiosis Essay
Meiosis is the process in sexually reproducing organisms where cells divide. The cells produced during meiosis have half the chromosome number as the original cell. There are two cell divisions in meiosis, meiosis l and meiosis ll. These cell divisions produce 4 hapolid daughter cells. Haploid cells contain only one set of chromosomes, which is written as n. Meiosis consists of nine phases. In ...
“Okay, thanks.” I finish. Well since I have nobody to talk to, I will just have to figure it out my self. Here I go… the first phase of Meiosis 11 is a short Interphase where the chromosomes do not replicate.
Okay on to the second phase, which is Prophase 11. It looks to me like each of the sister chromosomes are pulled to the center, and are starting to line up on the equator. Okay, I’m sure we are moved into Metaphase, the chromosomes are just attaching to the equator, also they aren’t lining up in any order, just lining up randomly, I think. Okay, now on to Anaphase. The chromosomes are splitting, and moving to opposite poles, oh that’s what Telophase, meant when he said the chromosomes are still paired. I see.
All right, I’m sure that I’m at the end. Well, It looks like the chromosomes are moving to each different cell. Each of those is haploid, which is just a single Unit cell, like for example (n).
And, at the end of the phases there is 4 non-identical daughter cells. Finally, the process of Meiosis is finished. But here are some tips and pointers on some things you might have missed though out the journey.
At the start of Meiosis, the cell is Diploid, because there are two units, and when it becomes a tetrad, it is 2 n. Also, a change that can happen is when the chromosomes don’t properly separate during the Meiosis phase. This is called nondisjunction al. This concludes Joe Bob’s Magical Meiosis Journey.
