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When are cells haploid but the chromosomes are still in the duplicated state?
Wiki User
∙ 13y ago
my college bio proffessor told me that even though chromosomes are still in the duplicated state, the chromosomes are duplicated so technically they do have "23" chromosomes but they instead have 2 sets of it. these 2 sets are the same so they dont count as a "full" set of 46 chromosomes. :) hope this helps!!
Wiki User
∙ 13y ago
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Why are egg and sperm cells haploid?
are little more than flagellated nuclei. Each consists of a head, which has an acrosome at its tip and contains a haploid set of chromosomes in a compact, inactive, state.
What is diploidy?
Diploid state of organisms is originated during process of fertilization of sexual reproduction. During fertilization, two haploid cells or gametes of different types are fused together to produce a diploid egg (zygote).
Egg and sperm cells are Haploid of Deploid?
Ploidy is the number of complete sets of chromosomes in a biological cell. In humans, the somatic cells that compose the body are diploid (containing two complete sets of chromosomes, one set derived from each parent), but sex cells (sperm and egg) are haploid. In contrast, tetraploidy (four sets of chromosomes) is a type of polyploidy and is common in plants, and not uncommon in amphibians, reptiles, and various species of insects. The number of chromosomes in a single non-homologous set is called the monoploid number (x). The haploid number (n) is the number of chromosomes in a gamete of an individual. Both of these numbers apply to every cell of a given organism. For humans, x = n = 23; a diploid human cell contains 46 chromosomes: 2 complete haploid sets, or 23 homologous chromosome pairs. In some species (especially plants), x and n differ, for example common wheat is an allopolyploid with six sets of chromosomes, two sets coming originally from each of three different species, with six sets of chromosomes in most cells and three sets of chromosomes in the gametes. The Australian bulldog ant, Myrmecia pilosula, a haplodiploid species has n = 1, the lowest known (and lowest theoretically possible) n. Euploidy is the state of a cell or organism having an integral multiple of the monoploid number, possibly excluding the sex-determining chromosomes. For example, a human cell has 46 chromosomes, which is an integer multiple of the monoploid number, 23. A human with abnormal, but integral, multiples of this full set (e.g. 69 chromosomes) would also be considered as euploid. Aneuploidy is the state of not having euploidy. In humans, examples include having a single extra chromosome (such as Down syndrome), or missing a chromosome (such as Turner syndrome). Aneuploidy is not normally considered -ploidy but -somy, such as trisomy or monosomy.Diploid (indicated by 2n) cells have two homologous copies of each chromosome, usually one from the mother and one from the father. The exact number of chromosomes may be one or two different from the 2 number yet the cell may still be classified as diploid (although with aneuploidy). Nearly all mammals are diploid organisms (the viscacha rats Pipanacoctomys aureus and Tympanoctomys barrerae are the only known exceptions as of 2004[verification needed]), although all individuals have some small fraction of cells that display polyploidy. Human diploid cells have 46 chromosomes and human haploid gametes (egg and sperm) have 23 chromosomes.
Are chromsomes duplicated during metaphase?
No, in Metaphase the chromosomes align in the center of the cell in association with the spindle fibers, and PREPARE to duplicate during the next phase of Mitosis, which is Anaphhase. The chromosomes are developing to duplicate throughout all phases of mitosis up until Anaphase when the chromosomes split into two and cytokinesis begins to take place so that two new cells will be formed.
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.
Are chromosomes in a duplicated or in unduplicated state when crossing over occurs?
It is in a duplicated state.
Are chromosomes in a duplicated or an unduplicated state when crossing over occurs?
It is in a duplicated state.
Why are egg and sperm cells haploid?
are little more than flagellated nuclei. Each consists of a head, which has an acrosome at its tip and contains a haploid set of chromosomes in a compact, inactive, state.
What is diploidy?
Diploid state of organisms is originated during process of fertilization of sexual reproduction. During fertilization, two haploid cells or gametes of different types are fused together to produce a diploid egg (zygote).
What actually is haploid?
Haploid is referred to a state in which only one set of chromosome is present from each Homologous pair. Suppose there is an organism that has three chromosomes: AA BB and XY. when the gametes are formed then the chromosomes will segregate and the cells formed are: ABX and ABY. These are both haploid sets.
Where does a diploid occur?
Every cell in the body, other than the sperm and egg cells, is diploid. This means that they all have the whole complement of two sets of 23 chromosomes, totalling 46. The gametes, sex cells, only have one set of 23 chromosomes. This is called haploid. This is so that when one haploid gamete from a female and another haploid gamete from a male fuse, a diploid cell will form and be able to mitotically replicate to produce an individual.
Why is pollen a diploid?
Not sure what level you're asking this on; pollen is not really haploid (it has several cells). Anyway, here goes: In normal sexual reproduction, half of each parents' DNA combines to form a new genetic code. A haploid cell has half the number of chromosomes contained in a diploid (normal) cell. This means that the offspring are a mixture of the characteristics of the parent organisms, creating variety within the population. If pollen was not haploid, it could not provide genetic material capable of binding to the ovum's genes. Pollen actually contains 3 haploid cells; so a pollen grain is not a single cell. When it meets the stamen of another plant, one cell forms a tube going down to the ova, acting as a sort of navigation system, while 2 of the cells follow. It was at this point that this mornings genetics lecture ended, so to find out what happens next, I'll have to wait until next Monday. Hope some of that was useful :)
State the purpose of meiosis?
the purpose of meiosis is to reduce the number of chromosomes in new cells to half the number of the original cell which is known as reduction division. The process also creates gamete cells which are also haploid cells because they contain half the DNA of the original cell.In simple terms the purpose of meiosis is to create genetically unique sex cells ( sperm and egg ) with half the normal number of chromosomes
Egg and sperm cells are Haploid of Deploid?
Ploidy is the number of complete sets of chromosomes in a biological cell. In humans, the somatic cells that compose the body are diploid (containing two complete sets of chromosomes, one set derived from each parent), but sex cells (sperm and egg) are haploid. In contrast, tetraploidy (four sets of chromosomes) is a type of polyploidy and is common in plants, and not uncommon in amphibians, reptiles, and various species of insects. The number of chromosomes in a single non-homologous set is called the monoploid number (x). The haploid number (n) is the number of chromosomes in a gamete of an individual. Both of these numbers apply to every cell of a given organism. For humans, x = n = 23; a diploid human cell contains 46 chromosomes: 2 complete haploid sets, or 23 homologous chromosome pairs. In some species (especially plants), x and n differ, for example common wheat is an allopolyploid with six sets of chromosomes, two sets coming originally from each of three different species, with six sets of chromosomes in most cells and three sets of chromosomes in the gametes. The Australian bulldog ant, Myrmecia pilosula, a haplodiploid species has n = 1, the lowest known (and lowest theoretically possible) n. Euploidy is the state of a cell or organism having an integral multiple of the monoploid number, possibly excluding the sex-determining chromosomes. For example, a human cell has 46 chromosomes, which is an integer multiple of the monoploid number, 23. A human with abnormal, but integral, multiples of this full set (e.g. 69 chromosomes) would also be considered as euploid. Aneuploidy is the state of not having euploidy. In humans, examples include having a single extra chromosome (such as Down syndrome), or missing a chromosome (such as Turner syndrome). Aneuploidy is not normally considered -ploidy but -somy, such as trisomy or monosomy.Diploid (indicated by 2n) cells have two homologous copies of each chromosome, usually one from the mother and one from the father. The exact number of chromosomes may be one or two different from the 2 number yet the cell may still be classified as diploid (although with aneuploidy). Nearly all mammals are diploid organisms (the viscacha rats Pipanacoctomys aureus and Tympanoctomys barrerae are the only known exceptions as of 2004[verification needed]), although all individuals have some small fraction of cells that display polyploidy. Human diploid cells have 46 chromosomes and human haploid gametes (egg and sperm) have 23 chromosomes.
What is an aneugen?
An aneugen is an aneugenic agent, an agent which induces aneuploidy, the state of possessing a number of chromosomes which is not an exact multiple of the haploid number.
Are chromsomes duplicated during metaphase?
No, in Metaphase the chromosomes align in the center of the cell in association with the spindle fibers, and PREPARE to duplicate during the next phase of Mitosis, which is Anaphhase. The chromosomes are developing to duplicate throughout all phases of mitosis up until Anaphase when the chromosomes split into two and cytokinesis begins to take place so that two new cells will be formed.
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.
