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What is the functional role of forming tetrads in meiosis and or mitosis?
Tetrads only appear in meiosis. The tetrad is the joining of four chromosomes in prophase I of meiosis. Two male duplicated chromosomes and two female chromosomes. The most important role of tetrad formation is ' crossing over. ' This is the exchange of genetic information between the male and female chromosomes. The material, whole genes, is physically swapped between the male and female chromosomes.
What is the change in chromosome number in meiosis?
The Reduction of Chromosome Number in Meiosis Is Determined by Properties Built into the Chromosomes. In meiosis I, two chromatids move to each spindle pole. Then, in meiosis II, the two are distributed, one to each future gamete. This requires that meiosis I chromosomes attach to the spindle differently than meiosis II chromosomes and that they regulate chromosome cohesion differently. We investigated whether the information that dictates the division type of the chromosome comes from the whole cell, the spindle, or the chromosome itself. Also, we determined when chromosomes can switch from meiosis I behavior to meiosis II behavior. We used a micromanipulation needle to fuse grasshopper spermatocytes in meiosis I to spermatocytes in meiosis II, and to move chromosomes from one spindle to the other. Chromosomes placed on spindles of a different meiotic division always behaved as they would have on their native spindle; e.g., a meiosis I chromosome attached to a meiosis II spindle in its normal fashion and sister chromatids moved together to the same spindle pole. We also showed that meiosis I chromosomes become competent meiosis II chromosomes in anaphase of meiosis I, but not before. The patterns for attachment to the spindle and regulation of cohesion are built into the chromosome itself. These results suggest that regulation of chromosome cohesion may be linked to differences in the arrangement of kinetochores in the two meiotic divisions.
Would genetic variability wipe out the whole human race during meiosis?
No.
What is the purpose of DNA replication.?
DNA replication is a necessary preliminary step for cell division, for both meiosis and mitosis. It creates the 2 chromatids that are found in chromosomes that are preparing to divide. By this process, the whole chromosome is essentially duplicated, but is still held together by a common centromere.
How do chromosomes affects homosexuality?
Genetic sequences in combination with certain gestational hormones have been linked to homosexuality in men, but whole chromosomes have no correlation to homosexuality.
When do chromosomes replicate during meiosis?
Chromosomes replicate in the Interphase part of Meiosis and throughout the whole process of Meiosis they only replicate once.
What is the functional role of forming tetrads in meiosis and or mitosis?
Tetrads only appear in meiosis. The tetrad is the joining of four chromosomes in prophase I of meiosis. Two male duplicated chromosomes and two female chromosomes. The most important role of tetrad formation is ' crossing over. ' This is the exchange of genetic information between the male and female chromosomes. The material, whole genes, is physically swapped between the male and female chromosomes.
Why is it important that chromosomal exchange occur during meiosis?
kasi po ci shiela mae tunan ay maganda pakasal keu usto mu?
Why does meiosis require two cellular divisions?
Meiosis is divided into Meiosis I and Meiosis II because the initial cell divides twice producing four genetically different sex cells (gametes) Each time a cell divides, it goes through Prophase, Metaphase, Anaphase, and Telophase. See the link below for a diagram showing the process.
How many chromosomes would you expect to find in a sperm cell?
24.This is because in chimpanzees, as in humans, the gametes (eggs and sperms) are formed by the type of division called meiosis. During meiosis, the number of chromosomes is halved.
What is the change in chromosome number in meiosis?
The Reduction of Chromosome Number in Meiosis Is Determined by Properties Built into the Chromosomes. In meiosis I, two chromatids move to each spindle pole. Then, in meiosis II, the two are distributed, one to each future gamete. This requires that meiosis I chromosomes attach to the spindle differently than meiosis II chromosomes and that they regulate chromosome cohesion differently. We investigated whether the information that dictates the division type of the chromosome comes from the whole cell, the spindle, or the chromosome itself. Also, we determined when chromosomes can switch from meiosis I behavior to meiosis II behavior. We used a micromanipulation needle to fuse grasshopper spermatocytes in meiosis I to spermatocytes in meiosis II, and to move chromosomes from one spindle to the other. Chromosomes placed on spindles of a different meiotic division always behaved as they would have on their native spindle; e.g., a meiosis I chromosome attached to a meiosis II spindle in its normal fashion and sister chromatids moved together to the same spindle pole. We also showed that meiosis I chromosomes become competent meiosis II chromosomes in anaphase of meiosis I, but not before. The patterns for attachment to the spindle and regulation of cohesion are built into the chromosome itself. These results suggest that regulation of chromosome cohesion may be linked to differences in the arrangement of kinetochores in the two meiotic divisions.
Would genetic variability wipe out the whole human race during meiosis?
No.
How many times does meiosis occur in a human?
Remember that meiosis occurs during the production and maturation of gametes so it occurs very often! In males, it occurs virtually throughout their whole life and in females, meiosis I completes at every ovulatory cycle until menopause and meiosis II completes with fertilization.
Can you see chromosomes with a light microscope during cell cycle?
NO light microscope can not magnify the image to see chromosomes. You can see with fluorescence microscopes to observe them during cell cycle. Light microscope is helpful to check the whole living cell.
Why does meiosis occur only in cells in the reproductive structures of the organism?
Meiosis is also called reduction division, because the result of meiosis is the production of cells with half the chromosome number of the parent cell (ie haploid cells). This is necessary so that when two gametes fuse during fertilization, the normal chromosome number is restored (ie a diploid cell).If the chromosome number was not halved during gamete (germ cell) formation, the number would be doubled every time fertilization happened.Somatic (body) cells do not undergo meiosis because the products of their division will not take part in fertilization. They divide by mitosis, which produces daughter cells with the same number of chromosomes as the parental cell. Mitosis occurs during growth, replacing damaged cells and asexual reproduction.See Related links
How many cells get produced in meiosis?
To answer this question, let's take a look at meiosis as a whole. Meiosis I: 1 Mother cell (with DNA that has been replicated) splits into two daughter cells (each are 2n). Meiosis II: Each of those 2 daughter cells split into two gametes (which are 1n each). Therefore at the end of meiosis 2, one daughter cell splits into two haploid cells. Remember, the mother cell (at the beginning of meiosis I) ends up splitting into a tetrad of haploid cells (ie. Mother cell splits into four haploid cells by completion of meiosis)
How does timing of a mutation change affect a trait in an offspring?
it's not as much the timing of the mutation. the genes of a human can be mutated during transcription of the DNA. if just one gene is thrown off, it can cause the whole chain to be affected. for instance, if an incorrect polypeptide is added to the chain where it shouldn't be added, every following gene will be off one spot. the mutations can happen during the DNA translation or when sex cells divide. that would be a mutation from the chromosomes; one missing chromosome that was not transferred correctly during cell division right from the beginning of when the sperm and egg meet can alter the whole offspring's function.
