This document discusses cell division and its importance. It covers:
- The importance of mitosis and meiosis in producing new cells and ensuring genetic material is passed down.
- The stages of mitosis and meiosis, including prophase, metaphase, anaphase and telophase.
- How meiosis results in genetic variation through independent assortment and crossing over, producing gametes like eggs and sperm.
- Applications like tissue culture and cloning. Consequences of uncontrolled mitosis like cancer are also addressed.
It is the presentation on the MEIOSIS phase of the Cell division.
It includes all the details and definitions that are related to the topic of meiosis with the labelled diagrams.
If you have any query or a question, you may ask in the comment box.
thanks.
Mitosis and meosis are two common phenomenons, one can get plenty information about these two but its significance is very rarely provided on social networks. Here is its significance, have a look.
It is the presentation on the MEIOSIS phase of the Cell division.
It includes all the details and definitions that are related to the topic of meiosis with the labelled diagrams.
If you have any query or a question, you may ask in the comment box.
thanks.
Mitosis and meosis are two common phenomenons, one can get plenty information about these two but its significance is very rarely provided on social networks. Here is its significance, have a look.
-Cell Division Process In Prokaryotes & Eukaryotes
-Compacting DNA into Chromosomes
-Types of Cell Reproduction
-Phases of the Cell Cycle
-Mitosis
-Meiosis
-Oogenesis & Spermatogenesis
-Comparison of Divisions
Presentasi mengenai stem cell, manfaat dan kegunaannya dalam menyembuhkan penyakit berbahaya, seperti kanker, stroke, jantung, diabetes, dll.
Nikmati hidup bebas rasa sakit dan selalu awet muda bersama Purtier Placenta:
http://www.stemcellworld.net
Chapter-6Cell Cycle and DivisionCell Divisio.docxchristinemaritza
Chapter-6
Cell Cycle and Division
Cell Division
Cells reproduce by cell division, in which a parent cell normally gives rise to two daughter cells
Each daughter cell receives a complete set of hereditary information (DNA) from the parent cell and about half its cytoplasm
The hereditary information DNA is usually identical with that of the parent cell
The cell division of eukaryotic cells by which organisms grow or increase in number is called mitotic cell division
After cell division, the daughter cells may differentiate, becoming specialized for specific functions
The repeating pattern of divide, grow, and differentiate, then divide again is called the cell cycle
Most multicellular organisms have three categories of cells
1. stem cells
2. Other cells capable of dividing
3. Permanently differentiated cells
1.Stem cells :
- have two important characteristics: self-renewal, and the ability to differentiate into a variety of cell types
-Stem cells self-renew because they retain the ability to divide, perhaps for the entire life of the organism
-Some stem cells in early embryos can produce any of the specialized cell types of the entire body
2. Other cells capable of dividing
-Some cells other than stem cells are capable of continuing to divide, but typically differentiate into only one or two different cell types
-Dividing liver cells, for example, can only become more liver cells
3. Permanently differentiated cells
-Permanently differentiated cells differentiate and never divide again
-For example, most heart and brain cells cannot divide
CELL CYCLE
Both prokaryotic and eukaryotic cells have cell cycles that include growth, metabolic activity, DNA replication, and cell division
However, they have major structural and functional differences
Eukaryotic chromosome
Eukaryotic chromosomes are separated from the cytoplasm by a membrane-bound nucleus
Eukaryotic cells always have multiple chromosomes
Eukaryotic chromosomes are longer and have more DNA than prokaryotic chromosomes (human chromosomes are 10 to 80 times longer and have 10 to 50 times more DNA)
Genes
Genes are segments of the DNA of a chromosome
Genes are sequences of DNA from hundreds to thousands of nucleotides long
Each gene occupies a specific place, or locus (plural, loci) on the chromosome
Two important parts of chromosome
Two telomeres
One centromere
It temporarily holds two daughter DNA double helices together after DNA replication
It is the attachment site for microtubules that move the chromosomes during cell division
Homologous
11
Chromosomes that contain the same genes are called homologous chromosomes, or homologues
Cells with pairs of homologous chromosomes are called diploid, which means “double”
Cells with half the number of chromosomes are called haploid
Human Chromosomes
A typical human cell has ...
1. Describe how variation in meiosis happens and why it is beneficia.pdffashioncollection2
1. Describe how variation in meiosis happens and why it is beneficial? Steps and functions of
mitosis and meiosis? ( I am having a hard time with defining each step in mitosis and meiosis.
There is meiosis I and II and I get confused on the steps with functions. Any ideas how I can
remember?)
TIA :)
Solution
Explanation:-
Variation in meiosis:-
During meiosis in humans, 1 diploid cell (with 46 chromosomes or 23 pairs) undergoes 2 cycles
of cell division but only 1 round of DNA replication. The result is 4 haploidHaving one copy of
each chromosome, or having a single set of chromosomes. Gametes (egg and sperm cells) are
haploid. daughter cells known as gametes or egg and sperm cells (each with 23 chromosomes – 1
from each pair in the diploid cell).
At conception, an egg cell and a sperm cell combine to form a zygote (46 chromosomes or 23
pairs). This is the 1st cell of a new individual. The halving of the number of chromosomes in
gametes ensures that zygotes have the same number of chromosomes from one generation to the
next. This is critical for stable sexual reproduction through successive generations.
Benefits of Meiosis:-
1. New Cell Generation-
The chromosomes created during meiosis are composed of 50% copies of the parent cell and
50% new cells. ‘Â These new cells are produced during the cross-over stages of the cell division
process. ‘Â During this stage half of the genetic material from the parent cell is copied into the
new cells, with the other half having distinct properties and characteristics.
2. DNA Replication
The process of meiosis involves copying or replication of genetic material from the parent cell
into the new cells. ‘Â As much as half of the genetic properties of the parent cell are copied into
the newly-created cells. ‘Â When applied to humans for example, DNA from both parents will
partly be copied onto the cells of their offspring. ‘Â When DNA is copied or replicated, the
offspring will also have similar qualities with either or both of his/her parents.
3. Genetic Variation
With meiosis, only half of the genetic material is replicated into the new cells. ‘Â This simply
means that the remaining half will be composed of unique genetic properties making each cell
different from the other. ‘Â Through this process, humans for example will all have different
genetic material and structure.
With the process involved in meiosis, humans are able to reproduce similar yet distinct offspring.
‘Â The whole process basically explains the fact that babies may share some genetic traits from
their parents but they will also have unique sets of personalities because of their unique genetic
composition.
Meiosis Stages:-
Prophase I
Chromosomes condense, Crossing over occurs
Metaphase I
Homologous chromosomes pair up and align in middle of cell
Anaphase I
Homologous chromosomes pulled apart
Telophase I
Nuclear Envelope reforms
Cytokinesis I
Cell splits into two
Prophase II
Centrioles divide and move to opposite poles
Metaphase II
Chromoso.
– Male and female gametes fuse together during fertilization to form a zygote. The chromosome number is halved during the formation of gametes by the process of meiosis. This maintains the chromosome number generations after generations. Meiosis leads to genetic diversity which is very essential for evolution.
The slides contain all about meiosis. in this slides i collected all information about meiosis. which is useful for everyone.
so watch these slides and comment for any problems.
thanks
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6. Cells in living things do not last forever, for they… Wear out after some time Get damaged (through cuts, by ultraviolet radiation or by hazardous environmental pollutants) Grow old naturally and die
7. Importance of new cells produced are genetically identical to their parent cells: Continue with the specific cell functions of their parent cells within a particular tissue Avoid disrupting the stable internal environment of life or its processes Produce offspring that have the complete functions of an adult organism (in asexual reproduction) to ensure the survival of that species
8. Significance of mitosis Nucleus contains chromosomes. Each chromosome consists of a long DNA molecule which carries genes in a linear sequence Gene determines the individual characteristics of an organism
9. Significance of mitosis The characteristic number of chromosomes is referred to as the chromosomal number of the species Exp: Onion cell – 16 chromosomes Exp: Fruit fly - 8 chromosomes
11. Significance of mitosis Somatic cells have two sets of chromosomes, one set inherited from each parent. Each cell contains a diploid number of chromosomes (2n) In humans, each set consist of 23 chromosomes. Typical human somatic cell, 46 chromosomes arranged in 23 pairs or 2n = 46
12. Significance of mitosis The two chromosomes in each pair have the same structural features and are referred to as homologous chromosomes
13. Significance of mitosis Gametes contain only one set of unpaired chromosomes, or haploid number of chromosomes (n)
27. Prophase I Each bivalent is visible under the microscope as a four-part structure called a tetrad
28. Prophase I A tetrad consists of two homologous chromosomes, each made up of two sister chromatids
29. Prophase I Non-sister chromatids exchange segments of DNA in a process known as crossing over. This results a new combination of genes on a chromosome
30. Prophase I The points a at which segments of chromatids cross over are called chiasmata.
31.
32. Metaphase I Chromosomes are lined up side by side as tetrads on the metaphase plate. The chromosomes are still in homologous pairs
33. Metaphase I One chromosome of each pair is attached to the spindle fibre from one pole while its homologue is attached to the fibre from the opposite pole
36. Anaphase I The spindle fibres pull the homologous chromosomes away from one another and move them to the opposite poles of the cell. Each chromosome still consist of two sister chromatids which move as a single unit.
37. Anaphase I Although the cell started with four chromosomes, only two chromosomes (each with two sister chromatids) move towards each pole.
38.
39. Telophase I The chromosomes arrive at the poles. Each pole now has a haploid nucleus because it contains only one set of chromosomes
40. Telophase I The spindle fibres disappear. The nuclear membrane reappears to surround each set of chromosomes. The nucleolus then reappears in each nucleus
41.
42. Prophase II The nuclear membranes of the daughter cells disintegrate again. The spindle fibres re-form in each daughter cell
43.
44. Metaphase II The chromosomes, each still made up of sister chromatids, are positioned randomly on the metaphase plate with the sister chromatids of each chromosome pointing towards the opposite poles.
45. Metaphase II Each sister chromatid is attached to the spindle fibres at the centromere
46.
47. Anaphase II The centromeres of the sister chromatids finally separate, and the sister chromatids of each chromosome are now individual chromosomes. The chromosomes move towards the opposite poles of the cell.
48.
49. Telophase II Finally, the nucleoli and nuclear membranes re-form. The spindle fibres break down. Cytokinesis follows and four haploid daughter cells are formed, each containing half the number of chromosomes and is genetically different from the parent diploid cell.
54. Mutation Mutation is a change in structure, arrangement or quantity of the DNA in the chromosome May be caused by: Mistakes in the replication of DNA Damage to the DNA by radioactive and carcinogenic substance Disruption to the orderly movement of chromosomes during cell division
55. In Mitosis If the functions of these genes are disrupted due to mutation, cancers may form. Somatic mutations are not transmitted to the offspring, but may cause body cells to malfunction Cancers are caused by somatic mutation
56. In Meiosis Meiosis involves an orderly movement and reduction (in meiosis I) of a diploid cell to two haploid cells that subsequently divide (in meiosis II) to form four haploid gametes Since these are gametes, so any mistakes – caused by disorderly movement of chromosomes during meiosis --- are inherited by the offspring.
57. Example: non-disjunction or improper segregation (separation) of chromosome During anaphase I, certain homologous chromosomes fail to segregate, resulting in the production of gametes with either an extra chromosome (n+1) or a missing chromosome (n-1) If this abnormal gametes unites with a normal gamete, an abnormal zygote will be produced.
58.
59. Down’s syndrome or mongolism 3 copies of chromosomes number 21, instead of the normal 2 chromosomes This means a down syndrome patient has (2n+1 = 47) 47 chromosomes instead of the normal (2n=46) chromosomes