Comparison of the processes of mitosis and meiosis. Mitosis produces two diploid (2n) somatic cells that are genetically identical to each other and the original parent cell, whereas meiosis produces four haploid (n) gametes that are genetically unique from each other and the original parent (germ) cell. Mitosis involves one cell division, whereas meiosis involves two cell divisions..
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- If our germ cells can do mitosis and meiosis, then when do they know when to use what?(11 votes)
- So is mitosis Asexual Reproduction, and Meiosis Sexual Reproduction?(7 votes)
- Not quite — reproduction is usually† used to mean the production of new organisms. Mitosis and meiosis are about the production of new cells.
Mitosis is the eukaryotic method for producing new cells with the same genetic composition as the mother cell.
For single celled eukaryotic organisms (e.g. yeasts) mitosis does result in asexual reproduction, but this not usually true in multicellular eukaryotes.
Thus, mitosis is one way§ that asexual reproduction can occur, but only when the cell is an entire organism.
In contrast, meiosis is a method for producing new cells with half the number of chromosomes that were found in the mother cell.
(Genetic recombination also takes place during meiosis.)
These cells typically become gametes in animals (other forms of life are more complicated‡) that then fuse to form zygotes that represent the next generation for that species.
This whole process is sexual reproduction, so it would be true to say that meiosis is a part of sexual reproduction.
For more information on reproduction:
Does that help?
†Note: Not all sources make this distinction.
§Note: Other forms of asexual reproduction include budding and binary fission (the most common type of cell division in prokaryotes).
‡Note: For information on other modes of sexual reproduction:
- Does mitosis have homologous pairs too?(2 votes)
- The chromosomes that make up the homologous pairs are present in diploid cells, but each member of a homologous pair of chromosomes behaves more-or-less independently in mitosis — i.e. since they don't pair up they just look like separate chromosomes.
Does that help?(4 votes)
- Do sperm and egg cells (once made) undergo mitosis to increase number?(1 vote)
- correct! once they fuse together theyre basically a normal cell which, in order to multiply, has to undergo mitosis(5 votes)
- Is it possible for a gamete to go through mitosis after it went through meiosis?(2 votes)
- A single gamete will not go through mitosis. But after fertilization, the zygote will have numerous mitotic divisions and specialization of cells in to specialized tissues(2 votes)
- When does the chromosomal crossover occur? Late prophase or Metaphase?(1 vote)
- Paired homologous chromosomes crossover while in synapsis, this happens during early prophase 1. By late prophase 1, the synaptonemal complex has disassembled and the homologues are only linked at places called chiasmata (singular, chiasma) where crossover occured. This all occurs before metaphase 1 begins.(4 votes)
- do the polar bodies stay in the ovaries throughout a females entire life?(2 votes)
- No, polar bodies undergo also second division and leave the ovaries/uterus via menstrual cycle.(1 vote)
- Justify why only gamete cells go through meiosis.(2 votes)
- Meiosis is the process of halving the amount of chromosomes to prepare for sexual reproduction. Since gametes are involved in sexual reproduction, their chromosome number must be halved since the male gamete will fertilize the female gamete, completing the diploid number.(1 vote)
- So basically mitosis is cell division and meiosis is the sexual reproduction of cells? I mean I watched the whole video and I just wanted to clarify.(1 vote)
- Kind of, but not quite. Mitosis is the process of a cell making an exact copy of itself. The end result is two daughter cells that are identical to each other in every way, essentially "clones" of each other, each with a full set of genetic information necessary for life. Meiosis, on the other hand, goes through two splitting processes to result in four gametes, also known as sex cells (sperm and eggs). The difference here is that each of the resulting gametes has only half of the chromosomes of the original cell, and thus only half of the genetic information for life.
I hope this helped!(3 votes)
- So does everybody have 46 cells(0 votes)
- No. I don't think any human has 46 cells. Humans have trillions of cells (rough estimate).
But I think you meant 46 chromosomes. If so most humans have 46 chromosomes in a single cell (23 pairs). Though some people do have 45 or 47.(5 votes)