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What is the importance of chromosome duplication prior to mitosis?
Wiki User
∙ 10y ago
If DNA didnot replicate, only half of the genetic material would go into each cell.
Wiki User
∙ 10y ago
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Is chromosome Y an acrocentric chromosome?
A chromosome is determined to be metacentric, acrocentric or telocentric by the location of its centromere. Centromeres are the point of attachment of two sister chromatids. Sister chromatids are formed during DNA replication prior to mitosis or meiosis. Chromosome Y by itself (when it is not replicating and there are no sister chromatids) is not acrocentric, as it wouldn't even have a centromere location.
Why are chromosomes replicated before Mitosis but not prior to Meiosis II?
Because it wants too
How many chromosome are in the original cell compared to those in the new cells formed by cell division?
In Mitosis when only 2 cells are formed out of one the number of chromosomes is the same in Meiosis when ultimately 4 new cells are formed the number of chromosomes is also the same, HOWEVER these chromosomes each contain half the number of genes as theses cells are gametes
How does mitosis make grown and repair of cells possible?
In mitosis, prior to the division of the cell the genetic material is doubled and the cytoplasm levels increase. After the cell divides, organelles are repaired and proteins/growth of cells continues with the manufacture of proteins from the full set of DNA the new cell has.
How many chromosomes would each of the gametes have the would cause Downs syndrome in a zygote?
In a condition such as Trisomy 21 (predominant form of Down syndrome) embryo starts developing with three copies of chromosome 21 instead of two. It is due to the failure in the separation of two (2n) chromosome 21 in either egg or sperm cell prior to or during fertilization. So precisely, the answer is, either one of sperm or egg gamete would have 24 chromosome (n) instead of 23
What is metaphase plate?
A disc extending across the nuclear area on which the chromosomes are found at the meraphase just prior to separation of the chromosome during mitosis.
Why are there two chromatids of each color what must have happened to each chromosome prior to mitosis?
There are two of each color because one is an exact duplicate of the other.
Is chromosome Y an acrocentric chromosome?
A chromosome is determined to be metacentric, acrocentric or telocentric by the location of its centromere. Centromeres are the point of attachment of two sister chromatids. Sister chromatids are formed during DNA replication prior to mitosis or meiosis. Chromosome Y by itself (when it is not replicating and there are no sister chromatids) is not acrocentric, as it wouldn't even have a centromere location.
Which process require prior DNA replication?
mitosis
Why are chromosomes replicated before Mitosis but not prior to Meiosis II?
Because it wants too
What is the name of the stage that a cell goes through just prior to mitosis?
Interphase, specifically Gap 2, or G2
How many chromosome are in the original cell compared to those in the new cells formed by cell division?
In Mitosis when only 2 cells are formed out of one the number of chromosomes is the same in Meiosis when ultimately 4 new cells are formed the number of chromosomes is also the same, HOWEVER these chromosomes each contain half the number of genes as theses cells are gametes
In preparation for mitosis DNA is copied this is called DNA?
DNA is not copied during mitosis. It is copied in the portion of the cell cycle prior to mitosis during the S phase of interphase and is called DNA Replication.
What happens during metaphase in the cell division?
Metaphase is the phase of cell division where chromosomes line up on the equator of the cell just prior to splitting to the poles at anaphase. During mitosis identical chromosomes pair up on the equator, wheras during meiosis the homologous pairs line up together during meiosis 1 and then homologous chromatids line up together in meiosis 2.
What is DNA replication and what is its function?
DNA replication is the process in which the DNA is copied prior to mitosis. It's purpose is to prepare the cell for mitosis, which is the division of the nucleus into two identical daughter nuclei, usually followed by cytokinesis, the division of the cytoplasm.
Which general phase of meiosis resembles mitosis?
Metaphase of both mitosis and meosis resemble one another. Here, the chromosomes are condensed and aligned at the centre of the cell just before it divides. This state prior to division is refered to as 'the formation of the metaphasic plane'
Why is it important the nuclear membrane disappears during mitosis?
A lot of things happen during mitosis. When the cell is OUT of mitosis, chromosomes are not discernible from each other ; the shapeless substance they form is called 'chromatin', and genes can be (and are) expressed at that stage. Then prior to mitosis, chromosomes duplicate (this is called the 'Replication'). During mitosis now : * Prophase: Chromosomes condense into the fully discernible "X-shaped" pairs that can be ordered by size. Each "X" is actually two identical chromosome molecules bound together ; genes are not expressed in this compact form. * Prometaphase: At that stage, the nuclear membrane disappears. // It is important because chromosomes are then accessible to the microtubules network. Actually two networks form, each from a center called centriole (one for each daughter cell, diametrically opposed on each side of the mother cell). // * Metaphase: The microtubule networks expand and bind to one of the molecules of each chromosome (each branch of the "X"). * Anaphase: When citokinesis occurs they contract, thus separating each chromosome molecule from its duplicate (hopefully one chromosome molecule of each pair going in each daughter cell). * Telophase: The nucleus membrane is then reformed in the daughter cells and chromosomes go back in chromatin form. Disclaimer : the disappearance of nucleic membrane is NOT common to all eukaryota (although it is for all animals). Some species perform the whole process with an intact nuclear membrane.
