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If an organism had 5 chromosomes in a haploid sex cell (n) then how many chromosomes would there be in its diploid body cell (2n) 1 point?
If an organism has 5 chromosomes in a haploid sex cell (n), then it would have 10 chromosomes in its diploid body cell (2n). This is because diploid cells contain two sets of chromosomes, one from each parent. Therefore, 2n equals 2 times n, which in this case is 2 times 5, resulting in 10 chromosomes.
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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 :)
When does an oocyte become a haploid cell?
meiosis starts off with interphase where it is a normal double chromosomed (chromatid because it is still loose and not in chromosome form yet) thingy. Then prophase I occurs which causes the chromosome to make rods of DNA called chromosomes, but these chromosomes are double homologous chromosomes because the DNA has been copied during the S phase of interphase (still diploid at this point). Then after metaphase, anaphase, and telophase, 2 new cells start forming and we know that metaphase, anaphase, and telophase split the double homologous chromosomes, so then the new cells still have double chromosomes (haploid but there are 2 copies of each chromosome), and another round of meiosis occurs (meiosis II) which splits the double chromosomes into just normal halpoid gametes. All this is in accordance to humans
Is a centromere an organized display of an organism's chromosomes?
No, the centromere is not an organized display of an organism's chromosomes. A centromere is the point of the chromosome where it is attached to a spindle during cell division.
What point do the cells haploid?
First I might note that your question implies that haploid is a verb... something cells do. That is not the case. Haploid is a state in which a cell is in. It is an adjective. It describes a cell that one has one copy of each chromosome. A better way to ask that would be...what cells are haploid in humans (or whatever organism you are interested it). Well that depends on the organism. Many organisms (fungi for example) live most of their lives as haploid organisms. But I am going to assume you are talking about humans. In humans the only haploid cells are gametes produced in the gonads. Sperm for males and eggs for females. These each contain 1 copy of each chromosome. Upon fertilization they merge and the resulting cell becomes diploid again... a state in which the organism (person) will remain in for the rest of its life with the exception of the gametes which it then produces.
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
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 :)
Why must the life cycle of sexually reproducing species alternate between haploid and diploid stages?
Meiosis maintains the normal diploid number by halving the number to make the gametes and then allowing the diploid number to be restored through fertilization. For example in humans: Germ cells undergo meiosis --> Sex reproduction 2n germ cells --> 1n gametes --> 2n fertilization
When does an oocyte become a haploid cell?
meiosis starts off with interphase where it is a normal double chromosomed (chromatid because it is still loose and not in chromosome form yet) thingy. Then prophase I occurs which causes the chromosome to make rods of DNA called chromosomes, but these chromosomes are double homologous chromosomes because the DNA has been copied during the S phase of interphase (still diploid at this point). Then after metaphase, anaphase, and telophase, 2 new cells start forming and we know that metaphase, anaphase, and telophase split the double homologous chromosomes, so then the new cells still have double chromosomes (haploid but there are 2 copies of each chromosome), and another round of meiosis occurs (meiosis II) which splits the double chromosomes into just normal halpoid gametes. All this is in accordance to humans
Why is it important that sex cells have have the numbers of chromosomes as body cells?
Sex cells must have half the number of chromosomes because when the the sperm fertilizes the egg, the total number of chromosomes in the offspring must be the same number as the parents.Diploid and Haploid CellsBody cells (or somatic cells as they are called in Biology) have diploid, or 2n number of chromosomes. Male and female sex cells have haploid, or n number of chromosomes. During the process of fertilization where the sperm (containing n number of chromosomes) fertilizes the ovum (also containing n number of chromosomes), they collectively reconstitute the diploid number thus creating a fertilized cell containing 2n number of chromosomes (n from ovum and n from sperm) This fertilized egg now containing the entire chromosomal constitution of the species (2n) goes on to develop into an embryo.While in interphase, human cells are carrying out their normal functions and have 46 chromosomes, though the DNA does not exist as chromosomes at this point. For humans, 46 is known as the haploid number. Once a cell is ready to divide, the DNA (called chromatin) condenses into chromatids. The chromatids duplicate, forming the familiar X shapes, called chromosomes. At this point, one human cell contains enough genetic material for 92 chromosomes, double the normal amount. This is the diploid number. In mitosis, the cell divides in two, and each new cell each has 46 chromosomes worth of genetic material, the normal amount.In meiosis, which produces sex cells, the resulting cells must each have 23 chromosomes because in sexual reproduction, 23 chromosomes from father + 23 chromosomes from mother = 46 chromosomes in the offspring. In meiosis, the number of chromosomes doubles, creating the diploid amount. The cell divides, so 2 cells with 46 chromosomes are produced. These cells then divide without duplicated DNA, so 4 cells with 23 chromosomes are produced. Keep in mind that the number of chromosomes is not related to the complexity of the organism. Humans have 46 chromosomes, ferns have over 1,000.
What is the first haploid stage of spermatogenesis?
In humans, cells are usually diploid or haploid. Diploid cells are two complete sets of chromosomes. At fertilization, we usually receive one complete set of chromosomes from each parent. Most of our body is diploid. Haploid cells have one complete set of chromosomes. Sex cells (sperm and eggs) are usually haploid. When two haploid cells fertilize each other, the resulting diploid cell can grow into a normal diploid embryo and ultimately to a full grown adult. Mitosis produces diploid cells and is called mitotic cell division. Meiosis produces haploid cells and is called meiotic cell division. The stages that describe the process of cell division are the same in both mitosis and meiosis. They are Prophase, Metaphase, Anaphase and Telophase. Mitosis and meiosis are part of a larger process called the cell cycle. The stage interphase is part of the cell cycle, but not part of either mitosis or meiosis. Meiosis consists of two rounds of cell division. The stages are distinguished from each other by using the Roman numerals I and II after the stage name, as in Metaphase I and Metaphase II. One full round of meiosis is Prophase I, Metaphase I, Anaphase I, Telophase I, Prophase II, Metaphase II, Anaphase II and finally Telophase II. Meiosis I the cell division that moves the cells from diploid to haploid. The exact stage of Meiosis I that moves the cell from diploid to haploid can be debated. Prophase I and Metaphase I are not options because the chromosomes have not really started to separate yet. Anaphase I is the first realistic answer because the chromosomes begin to separate. Telophase I shows the chromosome completely separated but the cell has not yet become two cells. The nuclei divide during a process called karyokinesis. The newly formed nuclei are in essence haploid, but the original cell is still intact and still has two full sets of chromosomes - albeit the sets are residing in different areas of the same cell. The cell divides into two cells shortly after Telophase I. Thi is called cytokinesis. At this point the new cells are certainly haploid. So the short answer is most definitely either anaphase I or telophase I. The stage that you choose will depend on the standards you use. Anaphase I will be the earliest by looking only at the nuclei. Telophase I will be the latest by looking only at the nuclei. Cytokinesis after Telophase I will be the latest. I am assuming that this is a question for a biology class. The key is to understand the difference between diploid and haploid and HOW they come about. Answering either Anaphase I or Telophase I should work IF you are able to support your answer by describing the process of Meiosis accurately.
Is a centromere an organized display of an organism's chromosomes?
No, the centromere is not an organized display of an organism's chromosomes. A centromere is the point of the chromosome where it is attached to a spindle during cell division.
What point do the cells haploid?
First I might note that your question implies that haploid is a verb... something cells do. That is not the case. Haploid is a state in which a cell is in. It is an adjective. It describes a cell that one has one copy of each chromosome. A better way to ask that would be...what cells are haploid in humans (or whatever organism you are interested it). Well that depends on the organism. Many organisms (fungi for example) live most of their lives as haploid organisms. But I am going to assume you are talking about humans. In humans the only haploid cells are gametes produced in the gonads. Sperm for males and eggs for females. These each contain 1 copy of each chromosome. Upon fertilization they merge and the resulting cell becomes diploid again... a state in which the organism (person) will remain in for the rest of its life with the exception of the gametes which it then produces.
Why is it important that cells have half the number of chromosomes as body cells?
In sexual reproduction, each parent contributes a sex cell with half as many chromosomes as the normal cells. The two sex cells combine and the zygote will have the proper total of chromosomes. In this way, the offspring inherit genetic information from both parents.
Which cells contain two sets of chromosomes?
A diploid cell is sometimes described as having two identical sets of chromosomes.This is because for each copy of a chromosome, such as chromosome 7, there is one other copy of the same chromosome.However, such a pair, known as homologous chromosomes, are not truly identical, as they do not have identical base sequences. At any given locus (point on the chromosome) there will be the same type of information, such as a gene, transcription factor, or repeating sequence. But the exact form (allele) will in many cases be different on the two homologous chromosomes.
What would happen is reproductive cells were diploid?
They would produce tetraploid offspring. Reproductive cells are also called sex cells (gametes). Gametes form a fertilized egg (zygote) when they combine their chromosomes in a single nucleus. So two diploid (2n) gametes would form a tetraploid (4n) zygote. (n is a symbol for the number of chromosomes in a single set.)Scientists believe that many plants have doubled their chromosome number at some point in the past, becoming tetraploid (in some cases more than once); coffee and wheat are just two examples. This sort of thing is rare in animals.
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 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
