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Why do meiotic cells divide twice?
Mitosis divides once because it is the starting process of the development of the cell. Where as meiosis divides twice since it is trying to duplicate the cells to create two new daughter cells for the creation process in species.
Does meiosis have an interphase where chromosomes are replicated?
Yes - interphase includes a synthesis stage (often called the 'S phase'), which comes after G1 and before G2. This is when the chromosomes are replicated.
Why might Cells from an advanced malignant tumor most often have very abnormal chromosomes and often an abnormal total number of chromosomes?
Chromosomally abnormal cells can still go through cell cycle checkpoints.
Is down syndrome a single gene disorder?
People with Down syndrome have an extra copy of chromosome 21 in every cell. Down syndrome most often occurs when chromosomes fail to separate properly during meiosis, when sex cells form. Hope this helps!!
Are germ cells formed during mitosis or meiosis?
Answer 1It is unclear what a "germ cell" is as this is not a biological term.As the Expert Judy Olmsted notes, if "germ cell" refers to gametes, i.e. cells that will be used in sexual reproduction, then meiosis is the process used to create them.If you are asking how bacteria and protists that cause diseases replicate, this depends on the species. Almost all bacteria and a significant majority of protists replicate by mitosis. The remainder replicate through sexual conjugation. There are also some species that replicate both ways, each under a different set of conditions.If you are asking how viruses that cause diseases replicate, this is through the invasion of the nucleus of the host cell and inserting genetic information so that the cells own production apparatus (usually ribosomes and similar) creates new viruses.Answer 2Germ cells are formed during meiosis. This term is in use for sexually reproducing organisms. Therefore, there is no doubt that the germ cells are produced during meiosis.
When does a cell go through meiosis?
First of all, most cells in the body divide through the process of mitosis, except for sex cells, sperm and eggs. They must divide through a different process, meiosis, because they must end up with half the number of chromosomes as a typical cell after they divide. Another word for a cell with half the normal amount of chromosomes is a haploid cell. Diploid cells are cells with the normal amount of chromosomes. Meiosis occurs much more often in men, who are constantly reproducing sperm, whereas women are born with all the eggs they will ever have. Cells go through meiosis whenever they are in need of creating more haploid sex cells.
Why do meiotic cells divide twice?
Mitosis divides once because it is the starting process of the development of the cell. Where as meiosis divides twice since it is trying to duplicate the cells to create two new daughter cells for the creation process in species.
Does replication occur during interkinesis?
No because the chromosomes are already duplicated No. DNA replication does not occur during interkinesis. Interkinesis is a breif rest period between meiosis I and meiosis II. In some species, daughter cells do not form, and meiosis II follows right after meiosis I. No. Because at this point, the first division of meiosis is complete. The cell now rests for a bit before beginning the second meiotic division. During this period, called interkinesis, the nuclear membrane in each of the two cells reforms around the chromosomes. In some cells, the spindle also disintegrates and the chromosomes relax (although most often, the spindle remains intact).
Down Syndrome most often occurs when-?
Down Syndrome often occurs when chromosomes fail to separate properly during meiosis.
Does meiosis have an interphase where chromosomes are replicated?
Yes - interphase includes a synthesis stage (often called the 'S phase'), which comes after G1 and before G2. This is when the chromosomes are replicated.
Why is meiosis sometimes called reduction division?
Due to the fact that meiosis consists of two "phases" or cycles and goes from a diploid state (2n) to a haploid state (n) it is often times referred to as reduction division. This is because the parent cell starts off with two sets of chromosomes and the daughter cells only end up with one set of chromosomes when the entire process is complete.
Why might Cells from an advanced malignant tumor most often have very abnormal chromosomes and often an abnormal total number of chromosomes?
Chromosomally abnormal cells can still go through cell cycle checkpoints.
How are cells of a person with Down syndrome different from those of a person without the disorder?
In Down syndrome, a person's cells have an extra copy of chromosome 21. In other words, instead of a pair of chromosomes, a person with Down syndrome has three of that chromosome. Down syndrome most often occurs when chromosomes fail to separate properly during meiosis. People with Down syndrome have a degree of mental retardation. Heart defects are also common, but can be treated.
How can nondisjunction in meiosis result in a diploid gamete?
If all of the chromosomes fail to separate in meiosis, then nondisjunction can result in a diploid gamete. This is a type of chromosomal mutation. In animals, a zygote produced from the union of a mutated diploid gamete and a normal haploid gamete will have triploidy, which is lethal. In plants, this is not necessarily lethal.
What is the name of the large often central organelle in eukaryotic cells that contains chromosomes?
Nucleus
Is down syndrome a single gene disorder?
People with Down syndrome have an extra copy of chromosome 21 in every cell. Down syndrome most often occurs when chromosomes fail to separate properly during meiosis, when sex cells form. Hope this helps!!
How often do nerve and muscle cells divide?
Muscles cells can undergo mitosis, but almost all nerve cells will not. This is true within the body and even when isolated and put into culture.
