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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
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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
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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
Describe how crossing over during meiosis in an individual organism recombies the genetic material of the? - Yahoo!7 Answers
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please answer by today or tomorrow 6am, thank you! 6 years ago Report Abuse by ecolink Member since: 27 December 2006 Total points: 63,258 (Level 7) Add Contact Block Best Answer - Chosen by Voters Crossing over happens during prophase I of meiosis I
During which stage of meiosis do synapsis and the formation of tetrads occur? - Yahoo! Answers India
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Member since: 25 April 2006 Total points: 52,879 (Level 7) Add Contact Block Best Answer - Chosen by Asker Save you the time : B- prophase 1 5 years ago Report Abuse Asker's Rating: Asker's Comment: Thanks, this was the correct answer! 0 stars - mark this as Interesting! Email Comment (0) Save Add to My Yahoo! Add to Del.icio.us RSS There are currently no comments for this question
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These are called homologous chromosomes because they contain the same genes, in the same order as each other, although the message in the genes may be slightly different between the two. For instance the eye colour gene on the chromosome from your mother may code for blue eyes, whilst the eye colour gene on the chromosome you got from your father encodes brown eyes.Crossing over only occurs between these homologous chromosomes
Chromosomal crossover - Wikipedia, the free encyclopedia
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He relied on the discovery of the Belgian Professor Frans Alfons Janssens of the University of Leuven who described the phenomenon in 1909 and had called it 'chiasmatypie'. Crossing over also accounts for genetic variation, because due to the swapping of genetic material during crossing over, the chromatids held together by the centromere are no longer identical
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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
Meiosis with Crossing Over
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If a gamete produced by that individual contains the blue eye color allele it is has an equally good chance of containing the blonde or the black hair color allele. Imagine an individual has two different alleles (versions of a gene) for eye color (blue and brown) and two different alleles for hair color (blonde and black)
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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
Meiosis with Crossing Over
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If a gamete produced by that individual contains the blue eye color allele it is has an equally good chance of containing the blonde or the black hair color allele. Imagine an individual has two different alleles (versions of a gene) for eye color (blue and brown) and two different alleles for hair color (blonde and black)
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asked May 30 in Biology by anonymous +1 vote 1 answer 215 views When designing an experiment, which of the following is critical in determining that your results are due to a specific treatment, and not to random variation or other factors that might affect outcome? asked Dec 24, 2012 in Biology by anonymous Send feedback Powered by Question2Answer Ask. In order for this to happen, five conditions must be met: 1) there must be no mutation; 2) there must be no gene flow between populations; 3) the populations must be very large; 4) all mating must be random; and 5) there must be no natural selection
Meiosis - Wikipedia, the free encyclopedia
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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
What happens during crossing over in meiosis? How does that increase genetic diversity? - Yahoo! Answers
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Thanks! 4 years ago Report Abuse by Kylie Pauleen Member since: June 19, 2009 Total points: 2,086 (Level 3) Add Contact Block Best Answer - Chosen by Voters Crossing over is a complex subject, but I will try my best to help you. Variation causes genetic and biological diversity because if every organism would be the same for ever, with no change in DNA or mutations, then there would be no evolution, and the species would die out some time
In mitosis and meiosis, when do synapsis and crossing over occur? - Yahoo! Answers
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It is in meiosis that variation occurs, so as to create variation, for survivial of fittest, due to natural selection etc., and I am sure that it would be scary for 10 billion people to look EXACTLY the same. Other Answers (1) by ecolink Member since: December 26, 2006 Total points: 63,258 (Level 7) Add Contact Block These do not happen at all in mitosis, only in meiosis
Biology chapter 13: Crossing over occurs during which phase ...
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When does crossing over occur in meiosis
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Why does crossing over occur in meiosis and not mitosis? well from what i understand mitosis is just the replication of a cell, a cell divides into two cells Does crossing over only occur in Meiosis? Yes
In what phase of meiosis does crossing over occur
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Last edit by Molly Stellwagen Answer History Related Answers: In what phase of meiosis does crossing over occur? Crossing over begins early in prophase I of meiosis. Why crossing over occur in pachytene phase of meiosis? that is because, in pachytene stage, the chromosomes appear as an independent unit or we can say tha During what phase of meiosis does synapsis and crossing over occur? prophase Crossing over occurs during which phase of meiosis? Crossing over occurs during Prophase I of meiosis
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
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
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
Describe how crossing over during meiosis in an individual organism recombies the genetic material of the? - Yahoo!7 Answers
please answer by today or tomorrow 6am, thank you! 6 years ago Report Abuse by ecolink Member since: 27 December 2006 Total points: 63,258 (Level 7) Add Contact Block Best Answer - Chosen by Voters Crossing over happens during prophase I of meiosis I
During which stage of meiosis do synapsis and the formation of tetrads occur? - Yahoo! Answers India
Member since: 25 April 2006 Total points: 52,879 (Level 7) Add Contact Block Best Answer - Chosen by Asker Save you the time : B- prophase 1 5 years ago Report Abuse Asker's Rating: Asker's Comment: Thanks, this was the correct answer! 0 stars - mark this as Interesting! Email Comment (0) Save Add to My Yahoo! Add to Del.icio.us RSS There are currently no comments for this question
These are called homologous chromosomes because they contain the same genes, in the same order as each other, although the message in the genes may be slightly different between the two. For instance the eye colour gene on the chromosome from your mother may code for blue eyes, whilst the eye colour gene on the chromosome you got from your father encodes brown eyes.Crossing over only occurs between these homologous chromosomes
Chromosomal crossover - Wikipedia, the free encyclopedia
He relied on the discovery of the Belgian Professor Frans Alfons Janssens of the University of Leuven who described the phenomenon in 1909 and had called it 'chiasmatypie'. Crossing over also accounts for genetic variation, because due to the swapping of genetic material during crossing over, the chromatids held together by the centromere are no longer identical
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
Meiosis with Crossing Over
If a gamete produced by that individual contains the blue eye color allele it is has an equally good chance of containing the blonde or the black hair color allele. Imagine an individual has two different alleles (versions of a gene) for eye color (blue and brown) and two different alleles for hair color (blonde and black)
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
Meiosis with Crossing Over
If a gamete produced by that individual contains the blue eye color allele it is has an equally good chance of containing the blonde or the black hair color allele. Imagine an individual has two different alleles (versions of a gene) for eye color (blue and brown) and two different alleles for hair color (blonde and black)
asked May 30 in Biology by anonymous +1 vote 1 answer 215 views When designing an experiment, which of the following is critical in determining that your results are due to a specific treatment, and not to random variation or other factors that might affect outcome? asked Dec 24, 2012 in Biology by anonymous Send feedback Powered by Question2Answer Ask. In order for this to happen, five conditions must be met: 1) there must be no mutation; 2) there must be no gene flow between populations; 3) the populations must be very large; 4) all mating must be random; and 5) there must be no natural selection
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
What happens during crossing over in meiosis? How does that increase genetic diversity? - Yahoo! Answers
Thanks! 4 years ago Report Abuse by Kylie Pauleen Member since: June 19, 2009 Total points: 2,086 (Level 3) Add Contact Block Best Answer - Chosen by Voters Crossing over is a complex subject, but I will try my best to help you. Variation causes genetic and biological diversity because if every organism would be the same for ever, with no change in DNA or mutations, then there would be no evolution, and the species would die out some time
In mitosis and meiosis, when do synapsis and crossing over occur? - Yahoo! Answers
It is in meiosis that variation occurs, so as to create variation, for survivial of fittest, due to natural selection etc., and I am sure that it would be scary for 10 billion people to look EXACTLY the same. Other Answers (1) by ecolink Member since: December 26, 2006 Total points: 63,258 (Level 7) Add Contact Block These do not happen at all in mitosis, only in meiosis
Biology chapter 13: Crossing over occurs during which phase ...
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
When does crossing over occur in meiosis
Why does crossing over occur in meiosis and not mitosis? well from what i understand mitosis is just the replication of a cell, a cell divides into two cells Does crossing over only occur in Meiosis? Yes
In what phase of meiosis does crossing over occur
Last edit by Molly Stellwagen Answer History Related Answers: In what phase of meiosis does crossing over occur? Crossing over begins early in prophase I of meiosis. Why crossing over occur in pachytene phase of meiosis? that is because, in pachytene stage, the chromosomes appear as an independent unit or we can say tha During what phase of meiosis does synapsis and crossing over occur? prophase Crossing over occurs during which phase of meiosis? Crossing over occurs during Prophase I of meiosis
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