Oogonia are the primordial oocytes formed inside females either during or shortly after birth. At this time, the formation of primary oocytes occurs during dictyate, which lasts until the surge of luteinizing hormone (LH) just before the onset of puberty. After menarche, a few of these cells will further develop each period into secondary oocytes, which are halted in metaphase II until fertilization. At the end of meiosis II, both polar bodies created to discard extra haploid sets of chromosomes disintegrate, leaving behind the oocyte which can then mature into an ovum. Thus, the correct order is the following order: oogonium, primary oocyte, secondary oocyte, and ovum.

Oogonia are the primordial oocytes formed inside females either during or shortly after birth. At this time, the formation of primary oocytes occurs during dictyate, which lasts until the surge of luteinizing hormone (LH) just before the onset of puberty. After menarche, a few of these cells will further develop each period into secondary oocytes, which are halted in metaphase II until fertilization. At the end of meiosis II, both polar bodies created to discard extra haploid sets of chromosomes disintegrate, leaving behind the oocyte which can then mature into an ovum. Thus, the correct order is the following order: oogonium, primary oocyte, secondary oocyte, and ovum.

Gametes are formed during the process of meiosis. Oogenesis is the process by which the female games are produced, which occurs in the ovary. The product of oogenesis is one mature egg from one primary oocyte; this occurs about once every four weeks in humans.

Gametes are formed during the process of meiosis. Oogenesis is the process by which the female games are produced, which occurs in the ovary. The product of oogenesis is one mature egg from one primary oocyte; this occurs about once every four weeks in humans.

Oogonia are the primordial oocytes formed inside females either during or shortly after birth. At this time, the formation of primary oocytes occurs during dictyate, which lasts until the surge of luteinizing hormone (LH) just before the onset of puberty. After menarche, a few of these cells will further develop each period into secondary oocytes, which are halted in metaphase II until fertilization. At the end of meiosis II, both polar bodies created to discard extra haploid sets of chromosomes disintegrate, leaving behind the oocyte which can then mature into an ovum. Thus, the correct order is the following order: oogonium, primary oocyte, secondary oocyte, and ovum.

Gametes are formed during the process of meiosis. Oogenesis is the process by which the female games are produced, which occurs in the ovary. The product of oogenesis is one mature egg from one primary oocyte; this occurs about once every four weeks in humans.

Crossing over is a process that happens between homologous chromosomes in order to increase genetic diversity. During crossing over, part of one chromosome is exchanged with another. The result is a hybrid chromosome with a unique pattern of genetic material. Gametes gain the ability to be genetically different from their neighboring gametes after crossing over occurs. This allows for genetic diversity, which will help cells participate in survival of the fittest and evolution.

Mitosis has only one round of chromosome separation and creates all cells, other than sex cells. For example skin cells. This process ends with two diploid cells that are genetically identical to the parent cell.

Meiosis is the process that generates the cells that occur in sexual reproduction cells, otherwise known as gametes. This process, since it has two rounds of chromosome separation, will end with 4 haploid cells, or half the genetic information of the parent cell.

A spermatid is the final product of spermatogenesis. It is a haploid cell, meaning it has only one copy of each allele (one of each chromosome instead of two). Normal diploid cells have two copies of each chromosome, for a total of 46. Spermatids have half this number, for a total of 23 chromosomes. Each chromosome is composed of only a single chromatid following division, for a total of 23 chromatids.

When the zygote is formed during the fusion of the sperm and egg cells, the final cell is diploid, containing 46 chromosomes (23 from each gamete).

An outline of spermatogenesis is given here for further understanding.

Spermatogenesis Timeline:

1. Spermatogonium (46 chromosomes, 92 chromatids)

- Has a pair of each chromosome, and each individual chromosome has two chromatids.

- Undergoes mitosis (normal cell division) to produce a primary speratocyte.

1. Primary spermatocyte (46 chromosomes, 46 chromatids)

- Has a pair of each chromosome and each individual chromosome has one chromatid.

- Then replicates its DNA, resulting in 46 chromosomes with 92 chromatids.

- Then undergoes meiosis I (homologous chromosome pairs separate), producing two secondary spermatocytes.

1. Secondary spermatocytes (23 chromosomes, 46 chromatids)

- Has one of each chromosome, and each individual chromosome has two chromatids.

- Each secondart spermatocyte undergoes meiosis II (chromatids of each chromosome separate, similar to mitosis), producing a total of four spermatids.

1. Spermatids (23 chromosomes, 23 chromatids).

- Has one of each chromosome, and each individual chromosome has one chromatid

The phases of mitosis can be described as follows:

During prophase chromatin condenses to form discrete chromosomes.

During metaphase microtubules attach to the kinetochores and chromatids begin segregating.

During anaphase sister chromatids have been separated and reside at opposite poles of the cell.

During telophase both sets of chromatids are surround by new nuclear membranes and chromosomes decondense into chromatin.

Cytokinesis (the dividing of the cytoplasm into two cells) follows telophase.

If the cell were arrested during telophase, distinct chromatids would no longer be visible.