These goals are accomplished in meiosis using a two-step division process. … Since cell division occurs twice during meiosis, one starting cell can produce four gametes (eggs or sperm). In each round of division, cells go through four stages: prophase, metaphase, anaphase, and telophase.
Why does meiosis occur in two stages?
Because meiosis creates cells that are destined to become gametes (or reproductive cells), this reduction in chromosome number is critical — without it, the union of two gametes during fertilization would result in offspring with twice the normal number of chromosomes!
Why is meiosis 2 necessary?
The cells are diploid, therefore in order to distribute the chromosomes eqully among the daughter cells so that they contain half the chromosome , Meiosis II is necessary. … It reduces the chromosome number to half so that the process of fertilisation can restore the original number in the zygote.
Why is meiosis II needed for gamete egg and sperm production?
Meiosis is a type of cell division that reduces the number of chromosomes in the parent cell by half and produces four gamete cells. This process is required to produce egg and sperm cells for sexual reproduction. … Meiosis begins with a parent cell that is diploid, meaning it has two copies of each chromosome.
What would happen if meiosis 2 did not occur?
If meiosis does not occur properly, an egg or sperm could end up with too many chromosomes, or not enough chromosomes. Upon fertilization, the baby could then receive an extra chromosome, or have a missing chromosome.
How do meiosis I and meiosis II contribute to genetic variation?
Because the duplicated chromatids remain joined during meiosis I, each daughter cell receives only one chromosome of each homologous pair. … By shuffling the genetic deck in this way, the gametes resulting from meiosis II have new combinations of maternal and paternal chromosomes, increasing genetic diversity.
How many chromosomes are at the end of meiosis II?
At the end of meiosis II, each cell (i.e., gamete) would have half the original number of chromosomes, that is, 15 chromosomes.