| Analysis of the search query | why are there only 23 chromosomes in each of the four cells at the end of meiosis |
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Top competitors on query "why are there only 23 chromosomes in each of the four cells at the end of meiosis"
http://www.sciencemuseum.org.uk/WhoAmI/FindOutMore/Yourbody/Whatdoyourcellsdo/Howoftenareyourcellsreplaced/Howdocellsgrowanddivide.aspx Competition: low
Errors at meiosis occur more often in the egg cell as women get older, so the chances of a woman having a baby with Down's syndrome rises from about one in 1300 for a woman aged 25, to one in 30 by age 40. Why is reshuffling DNA important? When a cell divides to make eggs or sperm (meiosis), the two chromosomes in each pair become closely entwined around each other
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
http://uk.answers.yahoo.com/question/index?qid=20091110172012AAjggM3 Competition: low
In the case of humans, each daughter cell receives 23 chromosomes, or one copy of each chromosome pair from the parent cell, which originally had 46 total or 23 pairs of chromosomes
http://faculty.clintoncc.suny.edu/faculty/Michael.Gregory/files/Bio%20101/Bio%20101%20Lectures/Mitosis/mitosis.htm Competition: low
After the screen opens, press Ctrl-F to view the animation in full screen mode.The Cell CycleThe cell cycle alternates between interphase and mitosis as diagrammed below. At high levels, activation occurs and the cycle resumes.Growth FactorsGrowth factors are molecules that stimulate nearby cells to divide by promoting the binding of cyclin to kinase.Under normal conditions, cyclin combines with kinase only when growth factors are present
http://quizlet.com/5126659/mitosis-meiosis-quiz-flash-cards/ Competition: low
(right above the bottom root cap) On an onion root tip, what is the root cap? contains cells that cover and protect the underlying growth region as the root pushed through the soil. (the top portion of the root after root cap and region of cell division On an onion root tip, what is the region of cell division? where cells are actively dividing but not increasing significantly in size
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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://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
Heredity and Traits
http://learn.genetics.utah.edu/content/begin/traits/ Competition: low
learn more HOW DO SCIENTISTS READ CHROMOSOMES? To "read" a set of chromosomes, scientists look for key features to identify their similarities and differences
Explain the process of meiosis? - Yahoo! Answers
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The Process of Meiosis The process of meiosis essentially involves two cycles of division, involving a gamete mother cell (diploid cell) dividing and then dividing again to form 4 haploid cells. Because the chromosomes of each parent undergo homologous recombination during meiosis, each gamete, and thus each zygote, will have a unique genetic blueprint encoded in its DNA
Meiosis - Simple English Wikipedia, the free encyclopedia
http://simple.wikipedia.org/wiki/Meiosis Competition: low
At any rate, the shuffling increases the variety of the offspring, and the variety gives at least some of the offspring a better chance of surviving in difficult times. Prophase I: The chromosomes become visible, the nuclear envelope disappears and the centrioles (located at the top and bottom of the nucleus) begin forming spindle fibres that envelope the chromosomes
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Why is Meiosis Important
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In case of animals, males that are unable to compete for mates, for example, succumb to predation or disease or fail to reproduce; small and weak organisms don't survive for long time. Therefore, in meiosis, the characteristics of parent chromosomes are combined with the characteristics of offspring chromosomes, which ultimately results in a new and unique set of chromosomes
Why is it important that sex cells have half the number of chromosomes as body cells
http://wiki.answers.com/Q/Why_is_it_important_that_sex_cells_have_half_the_number_of_chromosomes_as_body_cells Competition: low
While in interphase, human cells are carrying out their normal functions and have 46 chromosomes, though the DNA does not exist as chromosomes at this point. During the process of fertilization where the sperm (containing n number of chromosomes) fertilizes the ovum (also containing n number of chromosomes), they collectively reconstitute the diploid number thus creating a fertilized cell containing 2n number of chromosomes (n from ovum and n from sperm) This fertilized egg now containing the entire chromosomal constitution of the species (2n) goes on to develop into an embryo
How many chromosomes are there in each daughter cell after mitosis
http://wiki.answers.com/Q/How_many_chromosomes_are_there_in_each_daughter_cell_after_mitosis Competition: low
Last edit by Cvu12 Answer History Related Answers: How many chromosomes are there in each daughter cell after mitosis? There are 46 chromosomes or 23 pairs of chromosomes in each daughter cell after mitosis. Each daught How many chromosomes are in each daughter cell at the end if mitosis? At the end of mitosis, each daughter cell will have the normal number of chromosomes
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
Chromosome - Wikipedia, the free encyclopedia
http://en.wikipedia.org/wiki/Chromosome Competition: low
Compaction of the duplicated chromosomes during mitosis and meiosis results in the classic four-arm structure (pictured to the right) if the centromere is located in the middle of the chromosome or a two-arm structure if the centromere is located near one of the ends. In the nuclear chromosomes of eukaryotes, the uncondensed DNA exists in a semi-ordered structure, where it is wrapped around histones (structural proteins), forming a composite material called chromatin
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
Yahoo! Answers - Chromosomes halved during Meiosis?
http://sg.answers.yahoo.com/question/index?qid=20100215084420AA0hTUt Competition: low
Prophase II takes an inversely proportional time comp Source(s): I memorized a Wikipedia article about meiosis 1 month ago 4 years ago Report Abuse by ORK Member since: 24 January 2010 Total points: 5,974 (Level 5) Add Contact Block visit the following website. 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
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
http://biology.clc.uc.edu/courses/bio104/mitosis.htm Competition: low
Each of these cultures can be subjected to a different drug, thus enabling doctors to find the right drug sooner, while it may still be of help, and without needlessly subjecting the person to many kinds of toxic chemicals. The nuclear envelope has totally disintegrated and the polar fibers have reached the centromeres of the chromosomes and have begun interacting with them
What is the chromosome number in daughter cells formed by meiosis from diploid parent cells? - Yahoo! Answers
http://answers.yahoo.com/question/index?qid=20070812095642AA3p6ld Competition: low
However, in thinking about this process, what would happen if both gametes had the same number of chromosomes as the rest of the cells in the organism? When they fused to become a zygote, they would have two times the number of chromosomes as the rest of the cells in the organism. Reproduction can occur in several ways as vegetative propagation, such as in the development of runners in strawberry plants, or by special cells called vegetative spores which are products of mitosis
http://uk.answers.yahoo.com/question/index?qid=20100124152614AAROrEF Competition: low
In plants for example, a microspore will divide mitotically to form a pollen; and a (functional) megaspore will divide mitotically three times to form an embryo sac. Member since: 28 June 2008 Total points: 4,244 (Level 4) Add Contact Block 46 chromosomes have to be bumped up to 92 when the cell is preparing to divide
Errors at meiosis occur more often in the egg cell as women get older, so the chances of a woman having a baby with Down's syndrome rises from about one in 1300 for a woman aged 25, to one in 30 by age 40. Why is reshuffling DNA important? When a cell divides to make eggs or sperm (meiosis), the two chromosomes in each pair become closely entwined around each other
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
In the case of humans, each daughter cell receives 23 chromosomes, or one copy of each chromosome pair from the parent cell, which originally had 46 total or 23 pairs of chromosomes
After the screen opens, press Ctrl-F to view the animation in full screen mode.The Cell CycleThe cell cycle alternates between interphase and mitosis as diagrammed below. At high levels, activation occurs and the cycle resumes.Growth FactorsGrowth factors are molecules that stimulate nearby cells to divide by promoting the binding of cyclin to kinase.Under normal conditions, cyclin combines with kinase only when growth factors are present
(right above the bottom root cap) On an onion root tip, what is the root cap? contains cells that cover and protect the underlying growth region as the root pushed through the soil. (the top portion of the root after root cap and region of cell division On an onion root tip, what is the region of cell division? where cells are actively dividing but not increasing significantly in size
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
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
Heredity and Traits
learn more HOW DO SCIENTISTS READ CHROMOSOMES? To "read" a set of chromosomes, scientists look for key features to identify their similarities and differences
Explain the process of meiosis? - Yahoo! Answers
The Process of Meiosis The process of meiosis essentially involves two cycles of division, involving a gamete mother cell (diploid cell) dividing and then dividing again to form 4 haploid cells. Because the chromosomes of each parent undergo homologous recombination during meiosis, each gamete, and thus each zygote, will have a unique genetic blueprint encoded in its DNA
Meiosis - Simple English Wikipedia, the free encyclopedia
At any rate, the shuffling increases the variety of the offspring, and the variety gives at least some of the offspring a better chance of surviving in difficult times. Prophase I: The chromosomes become visible, the nuclear envelope disappears and the centrioles (located at the top and bottom of the nucleus) begin forming spindle fibres that envelope the chromosomes
403 Error - Forbidden File :: Georgia Perimeter College
Please try one of the following: If you are trying to access your instructor's page, send him or her this message by email for the correct address of their page
Sumanas, Inc. Animation Gallery
Links for commercial purposes, or downloading files for offline use is prohibited without the prior written permission of the copyright owner (indicated beneath each animation)
Why is Meiosis Important
In case of animals, males that are unable to compete for mates, for example, succumb to predation or disease or fail to reproduce; small and weak organisms don't survive for long time. Therefore, in meiosis, the characteristics of parent chromosomes are combined with the characteristics of offspring chromosomes, which ultimately results in a new and unique set of chromosomes
Why is it important that sex cells have half the number of chromosomes as body cells
While in interphase, human cells are carrying out their normal functions and have 46 chromosomes, though the DNA does not exist as chromosomes at this point. During the process of fertilization where the sperm (containing n number of chromosomes) fertilizes the ovum (also containing n number of chromosomes), they collectively reconstitute the diploid number thus creating a fertilized cell containing 2n number of chromosomes (n from ovum and n from sperm) This fertilized egg now containing the entire chromosomal constitution of the species (2n) goes on to develop into an embryo
How many chromosomes are there in each daughter cell after mitosis
Last edit by Cvu12 Answer History Related Answers: How many chromosomes are there in each daughter cell after mitosis? There are 46 chromosomes or 23 pairs of chromosomes in each daughter cell after mitosis. Each daught How many chromosomes are in each daughter cell at the end if mitosis? At the end of mitosis, each daughter cell will have the normal number of chromosomes
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
Chromosome - Wikipedia, the free encyclopedia
Compaction of the duplicated chromosomes during mitosis and meiosis results in the classic four-arm structure (pictured to the right) if the centromere is located in the middle of the chromosome or a two-arm structure if the centromere is located near one of the ends. In the nuclear chromosomes of eukaryotes, the uncondensed DNA exists in a semi-ordered structure, where it is wrapped around histones (structural proteins), forming a composite material called chromatin
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
Yahoo! Answers - Chromosomes halved during Meiosis?
Prophase II takes an inversely proportional time comp Source(s): I memorized a Wikipedia article about meiosis 1 month ago 4 years ago Report Abuse by ORK Member since: 24 January 2010 Total points: 5,974 (Level 5) Add Contact Block visit the following website. 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
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
Each of these cultures can be subjected to a different drug, thus enabling doctors to find the right drug sooner, while it may still be of help, and without needlessly subjecting the person to many kinds of toxic chemicals. The nuclear envelope has totally disintegrated and the polar fibers have reached the centromeres of the chromosomes and have begun interacting with them
What is the chromosome number in daughter cells formed by meiosis from diploid parent cells? - Yahoo! Answers
However, in thinking about this process, what would happen if both gametes had the same number of chromosomes as the rest of the cells in the organism? When they fused to become a zygote, they would have two times the number of chromosomes as the rest of the cells in the organism. Reproduction can occur in several ways as vegetative propagation, such as in the development of runners in strawberry plants, or by special cells called vegetative spores which are products of mitosis
In plants for example, a microspore will divide mitotically to form a pollen; and a (functional) megaspore will divide mitotically three times to form an embryo sac. Member since: 28 June 2008 Total points: 4,244 (Level 4) Add Contact Block 46 chromosomes have to be bumped up to 92 when the cell is preparing to divide
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