Mitosis and meiosis question?
All new cells come from previously existing cells. New cells are formed by the process of cell division which involves both replication of the cell's nucleus (karyokinesis) and division of the cytoplasm( cytokinesis). There are two types of nuclear division: mitosis and meiosis. Mitosis typically results in new somatic (body ) cells. Formation of an adult organism from a fertilized egg, asexual reproduction, regeneration, and maintenance or repair of body parts are accomplished through mitotic cell division. Meiosis results in the formation of either gametes (in animals) or spores ( in plants). These cells have half the chromosome number of the parent cell. You will study meiosis . Where does one find cells undergoing meiosis? Plants and animals differ in this respect. In higher plants the process of forming new cells is restricted to special growing regions called meristems. These regions usually occur at the tips of stems or roots. In animals, cell division occurs anywhere new cells are formed or as new cells replace old ones. However, some tissues in both plant and animals rarely divide once the organism is mature.
Question with Mitosis and Meiosis?
ok i read that in Mitosis when the chromosomes duplicate they are identical to eachother but when i moved on to study meiosis i learned that the chromosomes in mitosis are homologous chromosomes d they have the same genes in the same sequence but can have different alleles. So if the alleles are different for example one allele would could for blue and the other codes for red then the chromosomes would not be identical. Are homologous chromosomes only in Meiosis? How are the chromosomes in meiosis homologous if they are duplicated. Also which diploid cells divide to make 4 haploid cells? Which cells undergo meiosis? I thought it was sperm and egg cells but then i realized the cell must start with 46 chromosomes which duplicate to 92 so each of the 4 haploid cells can have 23 and can then can fertilize an egg cell or be fertilized. Thank you sooo much :)
Mitosis vs. Meiosis question?
Depends on where: In general, mitosis would be faster because it's only one division rather than 2. HOWEVER, many organisms (I'll focus on humans) arrest the cells in the gonads during meiosis. Females are born with all their eggs, all arrested in prophase I. They won't complete meiosis I until they are ovulated, and won't complete meiosis II unless they are fertilized, so technically that process could take 12 years or 50 years!
Mitosis and meiosis questions?
1.) At what stage in mitosis and meiosis are the chromosomes replicated? When do the chromosomes first become visible in the light microscope? 2.) The first meiotic division is often called the "reductional" division and the second meiotic division the "equational" division. which feature of the chromosome complement is reduced in the first meiotic division and which is kept equal in the second?
Mitosis and meiosis questions?
Alright, so I can answer a few of your questions, but you'll have to research some of these also. 1) The main difference between Mitosis and Meiosis is the way the genes are passed on. Mitosis is the process where a cell will divide with itself; like your skin's cells. Your epithelial cells divide themselves to produce more skin cells. The important thing here is the identical genetic code is passed on from cell to cell. Now Meiosis involves sexual reproduction. In meiosis the cell only has half the genetic code because it must join with another cell. For instance, sperm has half the genetic code of a normal cell because it must fertilize an egg. 2) Meiosis takes place during sexual intercourse; because both of the cells coming together only have 1/2 of their genetic code, the mixing allows for mutations to occur. 3) Mitosis happens at different times depending on what part of the body your at. For instance, your skin's cells are constantly dividing, thus mitosis occurs throughout the day on your skin. However, neurons only go through mitosis at the start of life since they do multiply later in life. 4) Alright so PMAT is basically the steps a cell goes through in mitosis and meiosis. PMAT2 is the steps that a cell goes through when in meiosis. Basically a cell going through meiosis will go through PMAT and then PMAT2 to produce gametes (eggs and sperm). 5) PMAT occurs at different times depending on the tissue. It really comes down to the genes in the nucleus which tell the cell to divide. PMAT2 however occurs after PMAT has happened in a cell going through meiosis. Whew, remember to research all this for yourself, it's been about a year since I studied this in my biology classes. Good luck on your test!
Mitosis and Meiosis Questions? Please Help!!!!!?
1. What is the objective of mitosis? The objective is reproduction. It is division and nucleic replication in eukariotes that results in two clonal diploid cells. 2. What mechanism(s) in mitosis allow this to occur? chromosome replication during S phase, phragmosome formation, chromatin condensation into chromosomes, kinetochore formation, chromosome alignment and separation. 3. What is the objective of meiosis? The objective is reproduction. It is a specific type of cell division required for sexual reproduction. One diploid cell undergoes meiosis to produce four haploid daughter cells. 4. What mechanism(s) in meiosis allow this to occur? Separation of homologous chromosomes, genetic recombination, chromosome alignment and separation.
Question concerning meiosis and mitosis?
NOT common in BOTH processes: 1.They make identical cells after cell division.-the daughter cells look alike as the parent cell in mitosis,but in meiosis the daughter cells have half the number of chromosome from parent cell. 2.They go through four stages of active cell division-there are four main stages in mitosis prophase, metaphase, anaphase and telophase. The cell only divide once. In meiosis there are eight stages the first circle prophase 1, metaphase 1, anaphase 1 and telophase 1 ;second cycle prophase 2, metaphase 2, anaphase 2 and telophase 2.
Questions of Meiosis, Mitosis and Gametes?
If someone can provide me answers to ANY of the following questions, and maybe a breif explanation (to make sure you did not just guess for points) that would be GREATLY appreciated. Best answer will be awarded... 1) Strictly speaking, mitosis and meiosis are divisions of the: A. Nuclear membrane and nuclear contents B. Cytoplasm and cell membrane C. Entire Cell D. Nucleus and cytoplasm E. Nuclear membrane and cell membrane 2) In females: A. 4 diploid eggs are formed B. 4 haploid eggs are formed C. 2 eggs and 2 unviable cells are formed D. 1 egg and 3 unviable cells are formed E. All eggs that are made are unviable 3) Which of these could be a normal gamete? (Gene 1: alleles G and g. Gene 2: alleles R and r) A. GgRr B. Gg C. GRr D. GggR E. Gr THANK YOU to anyone who answers!
What is the function of mitosis and meiosis?
Mitosis is a single nuclear division that forms in two nuclei. They are partitioned into two new daughter cells that have the same number of chromosomes as that of the parent cell.The purpose of mitosis is cell regeneration, growth, and asexual reproduction.1. Cell development and growthAfter meiosis, haploid gametes are produced and gametes are fused to form an embryo, then the embryo grows by using the mitosis process. This growth continues throughout an organism’s life. Therefore, in this way the original chromosomal set is preserved.2. Cell regenerationWhen the original cell is damaged or wounded then new cells are regenerated to replace damaged cells.3. Asexual reproductionSingle-celled and some multicellular organisms use mitosis process for asexual reproduction. Asexual reproduction such as fragmentation, budding etc.Meiosis is the nuclear division of diploid into haploid cells. This is necessary for sexual reproduction. It generates cells with half the number of chromosomes as the parent cell.The purpose of meiosis is the formation of gametes for sexual reproduction, to form haploid daughter cells which are called as gametes and to produce variance.1. Sexual reproduction is the formation of haploid cells and their fusion results in a diploid cell. Before sexual reproduction, the number of chromosomes in a diploid cell must be half.2. During meiosis, a diploid cell divides two times to produce four haploid daughter cells which are called as gametes. A diploid cell has all the genetic information and a haploid cell has half of the genetic information. This is required as when gametes of both parents fuse in sexual reproduction, then the offspring produced should have the proper number of genes.3. Genetic variation is formed meiosis in stages of prophase I and metaphase I. In prophase I stage, homologous chromosomes paired and exchange segments of genetic material. In metaphase 1, independent assortment occurs, where the chromosomes randomly placed in a cell and then are split up. This means that each daughter cell has a random assortment of genes.For all the biology related answers like this, feel free to ask us or visit our website: General Biology Questions, Advanced Biology Questions, Students Homework Help
mitosis and meiosis.?
http://www.vcbio.science.ru.nl/en/virtua... Mitosis and meiosis are the two tricky processes of cell division that send every biology student running to the textbooks. Students often confuse the functions of one for the other, are unclear as to what function each serves, or are unclear abut where each differs from the other. The first point to understand is where mitosis and meiosis take place. This is one of the first major differences between the two. Mitosis takes place within somatic cells (cells that make up the body), while meiosis takes place within gamete cells (sex cells). As such, meiosis produces more gamete cells, and mitosis produces somatic cells. Mitosis is the process which is responsible for replacing dead or wounded skin cells. Mitosis divides a single somatic cell into two daughter cells, while gametes are produced in fours; more specifically, one single cell produces four daughter cells. The type of cell that each process occurs in also affects how many chromosomes that each mother cell has. Somatic cells can have either a haploid or diploid of chromosomes. The number of chromosomes in the mother cell are duplicated in the new daughter cells, so both mother cell and daughter cell have an equal number of chromosomes. Meiosis' gamete cells are found only with a diploid of chromosomes. The mother cell will then divide leaving its four daughter cells with a haploid of chromosomes. This is because the chromosomes of a female and male sex cell merge when the female egg is fertilized and thus the new cell (formed through fertilization) will have a diploid of chromosomes from which to build upon as the new organism develops. DNA duplication is also confused as occurring in both Mitosis and Meiosis. In one regard, this assumption is correct. However, this correctness requires that a person specify at which stage of meiosis DNA duplication occurs. DNA duplication occurs during S phase of Mitosis as well as S phase of Meiosis I. Meiosis II does not see the S phase and as such does not see DNA duplication