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Events occur in the reverse order from the events of prophase you Each cell has only half the genetic information however another cell division is needed because each chromosome is still doubled?
It seems like you are describing the events of meiosis I. During prophase I of meiosis, homologous chromosomes pair up and exchange genetic material in a process called crossing over. This results in genetic diversity. Each resulting cell has half the number of chromosomes but each chromosome is still composed of two sister chromatids, so another division (meiosis II) is needed to separate the chromatids and produce haploid gametes.
What is another name for meiosis because the number is reduced from haploid to diploid?
Another name for meiosis, which results in the reduction of chromosome number from diploid to haploid, is reduction division.
What is the difference between prophase 1 and 2?
DURING PROPHASE I:Crossing over happens in chromosomes where genetic information is swapped from chromosome to another at a chiasma (chiasmata for multiple crossing over sections)Cell is Diploid 46 chromosomesDURING PROPHASE II:No Crossing over at this point, as it has already happened during prophase I.Cell is Haploid 23 chromosomesRead more: What_is_the_difference_between_prophase_I_and_prophase_II_of_meiosis
Where do homologous chromosomes pair and form synapses?
The most common form of synapsis occurs in the nuclei of cells undergoing the type of cell division called meiosis.It occurs during prophase I (i.e. prophase of the first meiotic division). Prophase I is subdivided into five stages, and synapsis occurs in the second of these (zygotene).Synapsis refers to the pairing of homologous chromosomes. For example, the chromosome 5 that you inherited from your mother pairs with the chromosome 5 that you inherited from your Dad. By "pairing" is meant the exact alignment of two chromosomes, so that each point (locus) on one chromosome is beside the corresponding point on the other.It does not only occur during meiosis. Some flies, including the intensively-studied fruit-fly Drosophila, can undergo endomitosis, which is the division of chromosomes without subsequent cytokinesis (splitting of the cytoplasm).The result? A considerable replication of chromosomal material within a single cell. A famous example is the giant (polytene) chromosomes of the salivary glands of Drosophila. In these giant chromosomes the genetic material is aligned, so this is another example of synapsis.
In which phase do chromosomes become visible?
The DNA of a cell condenses to form chromosomes during cell division or mitotis, called the M phase of the cell cycle. Specifically, chromosomes acquire their characteristic X shape in the metaphase stage of mitotis. Each chromosome consists of two sister chromatids joined at the centromere.
Events occur in the reverse order from the events of prophase you Each cell has only half the genetic information however another cell division is needed because each chromosome is still doubled?
It seems like you are describing the events of meiosis I. During prophase I of meiosis, homologous chromosomes pair up and exchange genetic material in a process called crossing over. This results in genetic diversity. Each resulting cell has half the number of chromosomes but each chromosome is still composed of two sister chromatids, so another division (meiosis II) is needed to separate the chromatids and produce haploid gametes.
What is another term for resting phase in the early prophase?
Another term for the resting phase in the early prophase of the cell cycle is the "pre-prophase stage." This stage marks the transition between interphase and prophase, where the cell prepares for nuclear division by condensing its chromatin and organizing its microtubule structures.
What is the difference between prophase I and prophase II of meiosis?
Prophase 1 vs Prophase 2 of meiosisDURING PROPHASE I:Crossing over happens in chromosomes where genetic information is swapped from chromosome to another at a chiasma (chiasmata for multiple crossing over sections)Cell is Diploid 46 chromosomesDURING PROPHASE II:No Crossing over at this point, as it has already happened during prophase I.Cell is Haploid 23 chromosomes
What is another name for meiosis because the number is reduced from haploid to diploid?
Another name for meiosis, which results in the reduction of chromosome number from diploid to haploid, is reduction division.
What is the difference between prophase 1 and 2?
DURING PROPHASE I:Crossing over happens in chromosomes where genetic information is swapped from chromosome to another at a chiasma (chiasmata for multiple crossing over sections)Cell is Diploid 46 chromosomesDURING PROPHASE II:No Crossing over at this point, as it has already happened during prophase I.Cell is Haploid 23 chromosomesRead more: What_is_the_difference_between_prophase_I_and_prophase_II_of_meiosis
Where do homologous chromosomes pair and form synapses?
The most common form of synapsis occurs in the nuclei of cells undergoing the type of cell division called meiosis.It occurs during prophase I (i.e. prophase of the first meiotic division). Prophase I is subdivided into five stages, and synapsis occurs in the second of these (zygotene).Synapsis refers to the pairing of homologous chromosomes. For example, the chromosome 5 that you inherited from your mother pairs with the chromosome 5 that you inherited from your Dad. By "pairing" is meant the exact alignment of two chromosomes, so that each point (locus) on one chromosome is beside the corresponding point on the other.It does not only occur during meiosis. Some flies, including the intensively-studied fruit-fly Drosophila, can undergo endomitosis, which is the division of chromosomes without subsequent cytokinesis (splitting of the cytoplasm).The result? A considerable replication of chromosomal material within a single cell. A famous example is the giant (polytene) chromosomes of the salivary glands of Drosophila. In these giant chromosomes the genetic material is aligned, so this is another example of synapsis.
In which phase do chromosomes become visible?
The DNA of a cell condenses to form chromosomes during cell division or mitotis, called the M phase of the cell cycle. Specifically, chromosomes acquire their characteristic X shape in the metaphase stage of mitotis. Each chromosome consists of two sister chromatids joined at the centromere.
What is the stage of cell division?
Cells constantly go through mitosis/meiosis. In mitosis there are 4 steps, Prophase, Metaphase, Anaphase, and Telophase. After the cell completes all four steps it will go into Interphase, which sets up for another mitosis cycle. Interphase takes about 30-45 minutes.
What happens from interphase to prophase?
the DNA has condensed from chromatin into chromosomes Interphase has three distinct phases: G1, S, and G2. In G1, the cell grows after its last mitosis cycle. In S (for "synthesis"), the cell synthesizes another copy of DNA. In G2, the cell doubles all the organelles and prepares for the beginning of mitosis. During prophase, chromatin condenses into chromosomes and the nuclear envelope breaks down.
What happens when nondisjunction takes place in cell division?
One cell is left without a particular chromosome and another with a duplicated chromosome.Source: An answer on wiki.answers.com that has been modified (by me).
What is difference between chromosome and chromatids?
A chromatid is one-half of two identical copies of a replicated chromosome. During cell division, the identical copies are joined together at the region of the chromosome called the centromere. They are known as sister chromatids. Once the paired sister chromatids separate from one another in anaphase of mitosis, each is known as a daughter chromosome. [source: About.com/Biology, see link below]
The centromere is a region in which?
The centromere is a region in a chromosome where the two sister chromatids are held together. It is responsible for ensuring proper chromosome segregation during cell division. It also plays a key role in attaching chromosomes to the mitotic spindle fibers.
