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Top competitors on query "if nondisjunction occurs in meiosis ii during gametogenesis what will be the result"
http://www.ksu.edu/biology/pob/genetics/defin.htm Competition: low
homologous chromosomes A pair of chromosomes in the same individual that carry the same type of information (eye color) but not necessarily the same alleles (blue or brown). At At at at AT AATt AATt AaTt AaTt AT AATt AATt AaTt AaTt At AAtt AAtt Aatt Aatt At AAtt AAtt Aatt Aatt recessive An allele which must be homozygous for it's effect to be observed
Chromosomes in cells - Human Molecular Genetics - NCBI Bookshelf
http://www.ncbi.nlm.nih.gov/books/NBK7572/ Competition: low
At the early stages of development, individual cells in the embryo are totipotent: each cell retains the capacity to differentiate into all the different types of cell in the body. Other cells (often distinguished by the suffix -blast , as in osteoblasts, chondroblasts, myoblasts, etc.) divide actively and act as precursors of terminally differentiated cells
http://www.uwyo.edu/wjm/repro/spermat.htm Competition: low
There are 12 different stages of the cycle in the bull of about 14 days each; approximately four cycles within a given region of the tubule occur before an A1 spermatogonia is transformed into a spermatozoa. During mitosis: chromosomes condense, the nuclear envelope disappears, and spindle fibers begin to form from microtubules (prophase); centromeres of duplicate sister chromatids align along the spindle equator (metaphase); chromatids separate and migrate toward opposite poles (anaphase); the mitotic apparatus is disassembled, autonomous nuclear envelopes are established, and the chromosomes uncoil (telophase)
Cell Division
http://www.uic.edu/classes/bios/bios100/lecturesf04am/lect16.htm Competition: low
Regulation of the Cell Cycle The cell cycle is controlled by a cyclically operating set of reaction sequences that both trigger and coordinate key events in the cell cycle The cell-cycle control system is driven by a built-in clock that can be adjusted by external stimuli (chemical messages) Checkpoint - a critical control point in the cell cycle where stop and go-ahead signals can regulate the cell cycle Animal cells have built-in stop signals that halt the cell cycles and checkpoints until overridden by go-ahead signals. Telophase The chromosomes decondense The nuclear envelope forms Cytokinesis reaches completion, creating two daughter cells Compare Telophase to the Telophase I and to the Telophase II stages of mitosis
Meiosis - definition from Biology-Online.org
http://www.biology-online.org/dictionary/Meiosis Competition: low
Meiosis produces four haploid cells that may develop into potential gametes so that when fertilization occurs, a new individual with the full number of genes results, thereby maintaining the integrity of chromosomal number across generations while promoting genetic diversity and variability in forms in the population. Meiosis is a vital process because it reduces the original number of chromosomes to half, and allows genetic variability by genetic recombination and independent assortment
Meiosis - New World Encyclopedia
http://www.newworldencyclopedia.org/entry/Meiosis Competition: low
Sexual reproduction is a near universal characteristic of living organisms, as is the differentiation of organisms into either male or female (or plus and minus). Nondisjunction is a common mechanism for trisomy (the presence of an extra chromosome in each cell) or monosomy ( the loss of one chromosome from each cell)
http://waynesword.palomar.edu/lmexer2a.htm Competition: low
In the following diagram, normal spermatogenesis is compared with spermatogenesis with nondisjunction at meiosis I (anaphase I) and nondisjunction at meiosis II (anaphase II). Crossing Over During Prophase I of Meiosis Crossing over occurs during synapsis of prophase I when the red and blue homologous chromosome doublets line up side-by-side
http://uk.answers.yahoo.com/question/index?qid=20061114105403AAK4du9 Competition: low
mitosis is the production of new cells exactly identical to the first (parent) cell - cut your skin you heal new skin cells (identical to the first) are produced 2. Member since: 09 November 2006 Total points: 598 (Level 2) Add Contact Block In general the other answers submitted to date are correct and should be helpful
http://biology.clc.uc.edu/courses/bio104/meiosis.htm Competition: low
Interestingly, because the homologous pairs line up during Metaphase I, there is a 50:50 chance of which one of each pair will go to each of the poles of the cell (like flipping a coin, where you can get either heads or tails). Therefore, in humans with 23 pairs of chromosomes, a gamete (egg or sperm) could have 223 or 8,388,604 possible combinations of chromosomes from that parent
XYY syndrome - Wikipedia, the free encyclopedia
http://en.wikipedia.org/wiki/XYY_syndrome Competition: low
However, FISH analyses of sperm, enabling hundreds of cells to be analyzed, have shown a very small increased faction of 24,YY spermatozoa in the ejaculate of XYY men (Table 12-1). Michael Court Brown, a physician and world authority on radiation biology and cytogenetics, was published in December 1968, the month he died at age 50
Gametogenesis
http://www.biology-questions-and-answers.com/gametogenesis.html Competition: low
What is the second polar body? After termination of the second meiotic division of the oocyte II two cells are generated: the egg cell proper and the second polar body. What is the difference between spermatocyte II and spermatid? The spermatids (n) are the products of the second division of meiosis (meiosis II) in the male gametogenesis
Meiosis - The Full Wiki
http://www.thefullwiki.org/Meiosis Competition: low
This content and its associated elements are made available under the same license where attribution must include acknowledgement of The Full Wiki as the source on the page same page with a link back to this page with no nofollow tag. The end result is production of four haploid cells (23 chromosomes, 1N in humans) from the two haploid cells (23 chromosomes, 1N * each of the chromosomes consisting of two sister chromatids) produced in meiosis I
Chapter 15: If nondisjunction occurs in meiosis II ...
http://www.funnelbrain.com/c-616940-if-nondisjunction-occurs-meiosis-ii-duringgametogenesis-will.html Competition: low
All right reserved *SAT, AP and Advanced Placement Program are registered trademarks of the College Board, which was not involved in the production of, and does not endorse, this product
http://quizlet.com/5062825/chapter-10-study-guide-meiosis-and-sexual-reproduction-flash-cards/ Competition: low
At the end of anaphase I, each chromosome is composed of two chromatids and at the end of anaphase II, sister chromatids have separated, becoming daughter chromosomes B. there is one chance in 23 of getting identical sets of chromosomes from one parent, times two because there are two parents; therefore, two siblings out of every 46 are really identical except for crossing-over
Nondisjunction - definition from Biology-Online.org
http://www.biology-online.org/dictionary/Nondisjunction Competition: low
Please contribute to this project, if you have more information about this term feel free to edit this page Results from our forum Using Colchicine for Polyploids So I was wondering... Supplement This could result to a condition wherein the daughter cells have an abnormal number of chromosomes; one cell having too many chromosomes while other cell having none
nondisjunction: Definition from Answers.com
http://www.answers.com/topic/nondisjunction Competition: low
In normal meiosis, there is a mechanism that monitors the correct formation of the spindle fibers, the correct attachment of the chromosomes to the spindle fibers, and the correct segregation of chromosomes. The precise reason for this is not entirely certain, but a simple explanation could be that the older a cell is, the more loosely controlled are the processes occurring within that cell
http://www2.estrellamountain.edu/faculty/farabee/biobk/BioBookmeiosis.html Competition: low
In flowering plants (angiosperms) the multicelled visible plant (leaf, stem, etc.) is sporophyte, while pollen and ovaries contain the male and female gametophytes, respectively. Events of Prophase I (save for synapsis and crossing over) are similar to those in Prophase of mitosis: chromatin condenses into chromosomes, the nucleolus dissolves, nuclear membrane is disassembled, and the spindle apparatus forms
NONDISJUNCTION
http://www.soc.hawaii.edu/ws350/spr04/nondisjunction.htm Competition: low
Although some have mild learning disabilities (such as speech and language delays and dyslexia), others have no problems at all and excel as honor students. Percentages of cells with the different karyotypes can vary widely among individuals and does not necessarily account for differences in the severity of developmental abnormalities
What is a nondisjunction disorder and when does it occur? ? - Yahoo! Answers
http://answers.yahoo.com/question/index?qid=20090126200451AAUgcY2 Competition: low
This could arise from a failure of homologous chromosomes to separate in meiosis I, or the failure of sister chromatids to separate during meiosis II or mitosis. what is the purpose of mitosis? what is the purpose of meiosis? 5 years ago Report Abuse by dunnohow Member since: August 22, 2007 Total points: 3,550 (Level 4) Add Contact Block Best Answer - Chosen by Voters Nondisjunction is the failure of chromosome pairs to separate properly during cell division
http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/M/Meiosis.html Competition: low
Homologous dyads (pairs of sister chromatids) find each other and align themselves from end to end with the aid of an axial element (that contains cohesin). However, cells going through meiosis have checkpoints that monitor each pair of homologues for proper recombination of their DNA correct formation of the synaptonemal complex Any failure that is detected stops the process and usually causes the cell to self-destruct by apoptosis
http://www.biologyexams4u.com/2012/09/what-happens-if-non-disjunction-occurs.html Competition: low
(somatic clones of monosomics) Nondisjunction in mitosis may lead to mosaicism In mitosis, nondisjunction lead to the formation of monosomics or trisomics and all cells derived from that cell carry this mistake resulting in a population of cells, but restricted to that site or tissue only. If any fault occur during meiosis, that can be disastrous as the first cell itself is a faulty cell and all cells derived from it by mitosis carry the same mistake
Meiosis - Wikipedia, the free encyclopedia
http://en.wikipedia.org/wiki/Meiosis Competition: low
Each of the resulting chromosomes in the gamete cells is a unique mixture of maternal and paternal DNA, resulting in offspring that are genetically distinct from either parent. In female mammals, meiosis begins immediately after primordial germ cells migrate to the ovary in the embryo, but in the males, meiosis begins later, at the time of puberty
Chapter 15: If nondisjunction occurs in meiosis II ...
http://www.funnelbrain.com/c-197786-if-nondisjunction-occurs-meiosis-ii-during-gametogenesis-wil.html Competition: low
All right reserved *SAT, AP and Advanced Placement Program are registered trademarks of the College Board, which was not involved in the production of, and does not endorse, this product
homologous chromosomes A pair of chromosomes in the same individual that carry the same type of information (eye color) but not necessarily the same alleles (blue or brown). At At at at AT AATt AATt AaTt AaTt AT AATt AATt AaTt AaTt At AAtt AAtt Aatt Aatt At AAtt AAtt Aatt Aatt recessive An allele which must be homozygous for it's effect to be observed
Chromosomes in cells - Human Molecular Genetics - NCBI Bookshelf
At the early stages of development, individual cells in the embryo are totipotent: each cell retains the capacity to differentiate into all the different types of cell in the body. Other cells (often distinguished by the suffix -blast , as in osteoblasts, chondroblasts, myoblasts, etc.) divide actively and act as precursors of terminally differentiated cells
There are 12 different stages of the cycle in the bull of about 14 days each; approximately four cycles within a given region of the tubule occur before an A1 spermatogonia is transformed into a spermatozoa. During mitosis: chromosomes condense, the nuclear envelope disappears, and spindle fibers begin to form from microtubules (prophase); centromeres of duplicate sister chromatids align along the spindle equator (metaphase); chromatids separate and migrate toward opposite poles (anaphase); the mitotic apparatus is disassembled, autonomous nuclear envelopes are established, and the chromosomes uncoil (telophase)
Cell Division
Regulation of the Cell Cycle The cell cycle is controlled by a cyclically operating set of reaction sequences that both trigger and coordinate key events in the cell cycle The cell-cycle control system is driven by a built-in clock that can be adjusted by external stimuli (chemical messages) Checkpoint - a critical control point in the cell cycle where stop and go-ahead signals can regulate the cell cycle Animal cells have built-in stop signals that halt the cell cycles and checkpoints until overridden by go-ahead signals. Telophase The chromosomes decondense The nuclear envelope forms Cytokinesis reaches completion, creating two daughter cells Compare Telophase to the Telophase I and to the Telophase II stages of mitosis
Meiosis - definition from Biology-Online.org
Meiosis produces four haploid cells that may develop into potential gametes so that when fertilization occurs, a new individual with the full number of genes results, thereby maintaining the integrity of chromosomal number across generations while promoting genetic diversity and variability in forms in the population. Meiosis is a vital process because it reduces the original number of chromosomes to half, and allows genetic variability by genetic recombination and independent assortment
Meiosis - New World Encyclopedia
Sexual reproduction is a near universal characteristic of living organisms, as is the differentiation of organisms into either male or female (or plus and minus). Nondisjunction is a common mechanism for trisomy (the presence of an extra chromosome in each cell) or monosomy ( the loss of one chromosome from each cell)
In the following diagram, normal spermatogenesis is compared with spermatogenesis with nondisjunction at meiosis I (anaphase I) and nondisjunction at meiosis II (anaphase II). Crossing Over During Prophase I of Meiosis Crossing over occurs during synapsis of prophase I when the red and blue homologous chromosome doublets line up side-by-side
mitosis is the production of new cells exactly identical to the first (parent) cell - cut your skin you heal new skin cells (identical to the first) are produced 2. Member since: 09 November 2006 Total points: 598 (Level 2) Add Contact Block In general the other answers submitted to date are correct and should be helpful
Interestingly, because the homologous pairs line up during Metaphase I, there is a 50:50 chance of which one of each pair will go to each of the poles of the cell (like flipping a coin, where you can get either heads or tails). Therefore, in humans with 23 pairs of chromosomes, a gamete (egg or sperm) could have 223 or 8,388,604 possible combinations of chromosomes from that parent
XYY syndrome - Wikipedia, the free encyclopedia
However, FISH analyses of sperm, enabling hundreds of cells to be analyzed, have shown a very small increased faction of 24,YY spermatozoa in the ejaculate of XYY men (Table 12-1). Michael Court Brown, a physician and world authority on radiation biology and cytogenetics, was published in December 1968, the month he died at age 50
Gametogenesis
What is the second polar body? After termination of the second meiotic division of the oocyte II two cells are generated: the egg cell proper and the second polar body. What is the difference between spermatocyte II and spermatid? The spermatids (n) are the products of the second division of meiosis (meiosis II) in the male gametogenesis
Meiosis - The Full Wiki
This content and its associated elements are made available under the same license where attribution must include acknowledgement of The Full Wiki as the source on the page same page with a link back to this page with no nofollow tag. The end result is production of four haploid cells (23 chromosomes, 1N in humans) from the two haploid cells (23 chromosomes, 1N * each of the chromosomes consisting of two sister chromatids) produced in meiosis I
Chapter 15: If nondisjunction occurs in meiosis II ...
All right reserved *SAT, AP and Advanced Placement Program are registered trademarks of the College Board, which was not involved in the production of, and does not endorse, this product
At the end of anaphase I, each chromosome is composed of two chromatids and at the end of anaphase II, sister chromatids have separated, becoming daughter chromosomes B. there is one chance in 23 of getting identical sets of chromosomes from one parent, times two because there are two parents; therefore, two siblings out of every 46 are really identical except for crossing-over
Nondisjunction - definition from Biology-Online.org
Please contribute to this project, if you have more information about this term feel free to edit this page Results from our forum Using Colchicine for Polyploids So I was wondering... Supplement This could result to a condition wherein the daughter cells have an abnormal number of chromosomes; one cell having too many chromosomes while other cell having none
nondisjunction: Definition from Answers.com
In normal meiosis, there is a mechanism that monitors the correct formation of the spindle fibers, the correct attachment of the chromosomes to the spindle fibers, and the correct segregation of chromosomes. The precise reason for this is not entirely certain, but a simple explanation could be that the older a cell is, the more loosely controlled are the processes occurring within that cell
In flowering plants (angiosperms) the multicelled visible plant (leaf, stem, etc.) is sporophyte, while pollen and ovaries contain the male and female gametophytes, respectively. Events of Prophase I (save for synapsis and crossing over) are similar to those in Prophase of mitosis: chromatin condenses into chromosomes, the nucleolus dissolves, nuclear membrane is disassembled, and the spindle apparatus forms
NONDISJUNCTION
Although some have mild learning disabilities (such as speech and language delays and dyslexia), others have no problems at all and excel as honor students. Percentages of cells with the different karyotypes can vary widely among individuals and does not necessarily account for differences in the severity of developmental abnormalities
What is a nondisjunction disorder and when does it occur? ? - Yahoo! Answers
This could arise from a failure of homologous chromosomes to separate in meiosis I, or the failure of sister chromatids to separate during meiosis II or mitosis. what is the purpose of mitosis? what is the purpose of meiosis? 5 years ago Report Abuse by dunnohow Member since: August 22, 2007 Total points: 3,550 (Level 4) Add Contact Block Best Answer - Chosen by Voters Nondisjunction is the failure of chromosome pairs to separate properly during cell division
Homologous dyads (pairs of sister chromatids) find each other and align themselves from end to end with the aid of an axial element (that contains cohesin). However, cells going through meiosis have checkpoints that monitor each pair of homologues for proper recombination of their DNA correct formation of the synaptonemal complex Any failure that is detected stops the process and usually causes the cell to self-destruct by apoptosis
(somatic clones of monosomics) Nondisjunction in mitosis may lead to mosaicism In mitosis, nondisjunction lead to the formation of monosomics or trisomics and all cells derived from that cell carry this mistake resulting in a population of cells, but restricted to that site or tissue only. If any fault occur during meiosis, that can be disastrous as the first cell itself is a faulty cell and all cells derived from it by mitosis carry the same mistake
Meiosis - Wikipedia, the free encyclopedia
Each of the resulting chromosomes in the gamete cells is a unique mixture of maternal and paternal DNA, resulting in offspring that are genetically distinct from either parent. In female mammals, meiosis begins immediately after primordial germ cells migrate to the ovary in the embryo, but in the males, meiosis begins later, at the time of puberty
Chapter 15: If nondisjunction occurs in meiosis II ...
All right reserved *SAT, AP and Advanced Placement Program are registered trademarks of the College Board, which was not involved in the production of, and does not endorse, this product
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