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Cells formed by mitosis are exact copies of their parent cells, containing the same number of chromosomes. If sex cells were formed from mitosis, they would contain the same number of chromosomes as the somatic cells, instead of half, as they do through meiosis. Combining the egg and sperm in normal sexual reproduction would then produce an offspring with twice the chromosomes as its parent, making it a completely different organism, providing it survives at all. This process would continue with each new generation have twice the chromosomes as its parent.
If a cell were to undergo mitosis instead of meiosis, it would result in the formation of two identical daughter cells with the same number of chromosomes as the parent cell. This would lead to an increase in the number of diploid cells rather than the production of haploid cells necessary for sexual reproduction.
The number of chromosomes would be diploid rather than haploid. For example, a human gamete produced by mitosis would have 46 chromosomes rather than 23. If this gamete were involved in fertilization, the resulting embryo would not survive.
During meiosis the number of chromosomes are matched into pairs (one from each parent) and then separated into two sets of one each - i.e the number of chromosomes is cut in half. In mitosis the chromosomes are replicated into double the usual number and then split into two identical sets - one for each new cell.
If the sperm and egg just did mitosis then each germ cell would have the full double set of chromosomes and then when they fused the resulting egg would have twice the normal number. With the number of chromosomes (and so the amount of DNA ) doubling every generation the species would not get far before the whole thing became untenable.
It normally happens in haploid cells and normal body cells.If sex cells do not undergo meioris chromoromal number would be doubled from generation to generation.And there will be no new characteristics.
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Do mitosis happen in sexual reproduction?
Mitosis does occur in sexual reproduction, but it is not part of the process of sexual reproduction itself. Instead, mitosis is responsible for the growth and repair of cells in the organism. During sexual reproduction, gametes are produced through meiosis, a process that reduces the number of chromosomes in half to create genetically diverse offspring.
What must happen before meiosis or mitosis can take place?
The cell must undergo DNA replication to ensure that each daughter cell will receive a complete set of chromosomes during meiosis or mitosis. This step is crucial for the accurate distribution of genetic material to the daughter cells.
Do crossovers usually occur during mitosis?
No, crossovers do not occur during mitosis. Crossovers, also known as genetic recombination, happen during meiosis, specifically during prophase I. Mitosis is the cell division process that results in two identical daughter cells, while meiosis is the cell division process that results in four genetically unique daughter cells.
What phase happens only once in meiosis?
The phase that happens only once in meiosis is prophase I, which is characterized by the pairing of homologous chromosomes and the exchange of genetic material through crossing over. This phase is unique to meiosis and does not occur in mitosis.
When does independent assortment occur in mitosis?
Independent assortment occurs during metaphase I of meiosis, not during mitosis. During independent assortment, homologous chromosomes line up randomly at the metaphase plate, leading to different combinations of maternal and paternal chromosomes in the daughter cells.
Do mitosis happen in sexual reproduction?
Mitosis does occur in sexual reproduction, but it is not part of the process of sexual reproduction itself. Instead, mitosis is responsible for the growth and repair of cells in the organism. During sexual reproduction, gametes are produced through meiosis, a process that reduces the number of chromosomes in half to create genetically diverse offspring.
When does crossing over happen in mitosis 1?
Mitosis does its crossing over in prophase
What is the difference between prophase mitosis and prophase meiosis?
In prophase I of meiosis, crossing over of homologous chromosomes occurs. This does not happen in prophase of mitosis.
What stage of mitosis does replication happen in?
Replication does not take place during mitosis. It takes place before meiosis begins.
When does replication happen during mitosis or meiosis?
Replication occurs during the S phase of the cell cycle before both mitosis and meiosis. In mitosis, the replicated DNA is separated into two identical daughter cells. In meiosis, the replicated DNA is separated into four haploid daughter cells with genetic variation.
Mitosis happen's where?
Mitosis occurs in the nucleus of a eukaryotic cell. It is the process of cell division that results in two daughter cells with identical genetic material to the original parent cell.
What must happen before meiosis or mitosis can take place?
The cell must undergo DNA replication to ensure that each daughter cell will receive a complete set of chromosomes during meiosis or mitosis. This step is crucial for the accurate distribution of genetic material to the daughter cells.
Do crossovers usually occur during mitosis?
No, crossovers do not occur during mitosis. Crossovers, also known as genetic recombination, happen during meiosis, specifically during prophase I. Mitosis is the cell division process that results in two identical daughter cells, while meiosis is the cell division process that results in four genetically unique daughter cells.
What phase happens only once in meiosis?
The phase that happens only once in meiosis is prophase I, which is characterized by the pairing of homologous chromosomes and the exchange of genetic material through crossing over. This phase is unique to meiosis and does not occur in mitosis.
What must happen before meiosis happen?
Before Meiosis 2, the cell must first go through Meiosis 1. This is when the cell splits into two cells, each with two chromosomes.
How did mitosis and meiosis happen?
Very very gradually; we are told that origin of the two sexes occurred just about six hundred million years ago.
How is mitosis from meiosis?
The difference between mitosis and mieosis is that mitosis creates two cells with the same number of chromosomes as the original cell, and mieosis creates four cells with half the number of chromosomes as the original cell (theses cells are used for reproduction)Mitosis is the process of cell division in somatic cells to make 2 identical diploid cells. ItMeiosis is a process of cell division that creates 4 haploid cells that are not completely identical. Meiosis creates sex cells or gametes.mitosis gives a diploid cell (2n) but meiosis gives a haploid cell (n) with half the chromosome number. meiosis is for sex cells where as mitosis is for somatic (body cells). during mitosis the chromosomes "cross over" and the genitic information is exchanged but this dosent happen in meiosis.
