Does meiosis happen in germ cells?
Meiosis I is a unique cell division that occurs only in germ cells; meiosis II is similar to a mitotic division. Before germ cells enter meiosis, they are generally diploid, meaning that they have two homologous copies of each chromosome.
Does fertilization occur in mitosis or meiosis?
Meiosis occurs before fertilization.
Why do meiosis and mitosis occur in germ cells?
Meiosis occurs in germ cells. Both mitosis and meiosis occur in germ cells as they are required to develop and grow the complicated organ structures of its parents which necessitates cell division. Hence, mitosis and meiosis ensures cell division and organization occurs in germ cells.
How do germ cells divide?
Germline cells can divide by mitosis to produce more germline cells to maintain the diploid chromosome number. Diploid cells have 23 pairs of homologous chromosomes. They can also divide bymeiosis to produce haploid gametes.
Does mitosis happen in germ cells?
Germ cells are the only cells in the body that have half the amount of chromosomes, undergo both mitosis and meiosis and in males produce the gamete, sperm.
Why does meiosis and mitosis occur in germ cells Class 12?
Answer: Meiosis and mitosis occur in germ cells. This is because, the germ cells need to grow and develop the complex organ system of its parents, for which cell division is absolutely important. It is mitosis and meiosis that ensures this cell division and organisation in a germ cell.
Does meiosis only occur during fertilization?
Meiosis only occurs in reproductive cells, as the goal is to create haploid gametes that will be used in fertilization. Meiosis is important to, but not the same as, sexual reproduction.
Does fertilization occur in mitosis?
The fertilized cell is a zygote. The zygote undergoes mitosis to form two identical cells that remain attached. This takes place about 36 hours after fertilization. Mitosis then occurs more frequently.
Does mitosis and meiosis occur in germ cells?
Does mitosis occur in germ cells?
How is mitosis different from meiosis?
Cells divide and reproduce in two ways, mitosis and meiosis. Mitosis results in two identical daughter cells, whereas meiosis results in four sex cells. Below we highlight the keys differences and similarities between the two types of cell division.
What would happen if egg and sperm were produced by mitosis instead of meiosis?
What would happen if gametes were made by mitosis instead of meiosis? Explanation: If gametes were produced instead by mitosis each gamete would be diploid not haploid. During fertilization of diploid gametes, the zygote would become 4n=92.
Does meiosis occur before or after fertilization?
does meiosis occur after fertilization? Meiosis occurs over two cycles of cell division, which sperm cells complete before fertilization. Meiosis in the egg cell stops during metaphase of the second cycle. At fertilization, meiosis II resumes and the duplicate copies of each chromosome are pulled apart.
What is the difference between germ cells and somatic cells?
Whereas somatic cells undergo mitosis to proliferate, the germ cells undergo meiosis to produce haploid gametes (the sperm and the egg). The development of a new progeny organism is then initiated by the fusion of these gametes at fertilization.
What happens to the sister chromatids after meiosis 1?
Sister chromatids remain together, so completion of meiosis I results in the formation of daughter cells containing a single member of each chromosome pair (consisting of two sister chromatids). Meiosis I is followed by meiosis II, which resembles mitosis in that the sister chromatids separate and segregate to different daughter cells.
How does meiosis reduce the number of chromosomes?
This reduction in chromosome number is accomplished by two sequential rounds of nuclear and cell division (called meiosisI and meiosis II), which follow a single round of DNAreplication. Like mitosis, meiosis I initiates after S phasehas been completed and the parental chromosomes have replicated to produce identical sister chromatids.