Which of the following best describes cells that result from the process of meiosis in mammals?

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.

Differences

Mitosis

  • Involves one cell division
  • Results in two daughter cells
  • Results in diploid daughter cells (chromosome number remains the same as parent cell)
  • Daughter cells are genetically identical
  • Occurs in all organisms except viruses
  • Creates all body cells (somatic) apart from the germ cells (eggs and sperm)
  • Prophase is much shorter
  • No recombination/crossing over occurs in prophase.
  • In metaphase individual chromosomes (pairs of chromatids) line up along the equator.
  • During anaphase the sister chromatids are separated to opposite poles.

Meiosis

  • Diploid parent cell
  • Consists of interphase, prophase, metaphase, anaphase and telophase
  • In metaphase individual chromosomes (pairs of chromatids) line up along the equator.
  • During anaphase the sister chromatids are separated to opposite poles.
  • Ends with cytokinesis.

Similarities

Mitosis

  • Involves two successive cell divisions
  • Results in four daughter cells
  • Results in haploid daughter cells (chromosome number is halved from the parent cell)
  • Daughter cells are genetically different
  • Occurs only in animals, plants and fungi
  • Creates germ cells (eggs and sperm) only
  • Prophase I takes much longer
  • Involves recombination/crossing over of chromosomes in prophase I
  • In metaphase I pairs of chromosomes line up along the equator.
  • During anaphase I the sister chromatids move together to the same pole.
  • During anaphase II the sister chromatids are separated to opposite poles.

Meiosis

  • Diploid parent cell
  • Consists of interphase, prophase, metaphase, anaphase and telophase (but twice!)
  • In metaphase II individual chromosomes (pairs of chromatids) line up along the equator.
  • During anaphase II the sister chromatids are separated to opposite poles.
  • Ends with cytokinesis.

This page was last updated on 2021-07-21

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  • During meiosis one cell divides twice to form four daughter cells.
  • These four daughter cells only have half the number of chromosomes of the parent cell – they are haploid.
  • Meiosis produces our sex cells or gametes (eggs in females and sperm in males).

Meiosis can be divided into nine stages. These are divided between the first time the cell divides (meiosis I) and the second time it divides (meiosis II):

Meiosis I

1. Interphase:

  • The DNA in the cell is copied resulting in two identical full sets of chromosomes.
  • Outside of the nucleus are two centrosomes, each containing a pair of centrioles, these structures are critical for the process of cell division.
  • During interphase, microtubules extend from these centrosomes.

2. Prophase I:

  • The copied chromosomes condense into X-shaped structures that can be easily seen under a microscope.
  • Each chromosome is composed of two sister chromatids containing identical genetic information.
  • The chromosomes pair up so that both copies of chromosome 1 are together, both copies of chromosome 2 are together, and so on.
  • The pairs of chromosomes may then exchange bits of DNA in a process called recombination or crossing over.
  • At the end of Prophase I the membrane around the nucleus in the cell dissolves away, releasing the chromosomes.
  • The meiotic spindle, consisting of microtubules and other proteins, extends across the cell between the centrioles.

3. Metaphase I:

  • The chromosome pairs line up next to each other along the centre (equator) of the cell.
  • The centrioles are now at opposites poles of the cell with the meiotic spindles extending from them.
  • The meiotic spindle fibres attach to one chromosome of each pair.

4. Anaphase I:

  • The pair of chromosomes are then pulled apart by the meiotic spindle, which pulls one chromosome to one pole of the cell and the other chromosome to the opposite pole.
  • In meiosis I the sister chromatids stay together. This is different to what happens in mitosis and meiosis II.

5. Telophase I and cytokinesis:

  • The chromosomes complete their move to the opposite poles of the cell.
  • At each pole of the cell a full set of chromosomes gather together.
  • A membrane forms around each set of chromosomes to create two new nuclei.
  • The single cell then pinches in the middle to form two separate daughter cells each containing a full set of chromosomes within a nucleus. This process is known as cytokinesis.

Meiosis II

6. Prophase II:

  • Now there are two daughter cells, each with 23 chromosomes (23 pairs of chromatids).
  • In each of the two daughter cells the chromosomes condense again into visible X-shaped structures that can be easily seen under a microscope.
  • The membrane around the nucleus in each daughter cell dissolves away releasing the chromosomes.
  • The centrioles duplicate.
  • The meiotic spindle forms again.

7. Metaphase II:

  • In each of the two daughter cells the chromosomes (pair of sister chromatids) line up end-to-end along the equator of the cell.
  • The centrioles are now at opposites poles in each of the daughter cells.
  • Meiotic spindle fibres at each pole of the cell attach to each of the sister chromatids.

8. Anaphase II:

  • The sister chromatids are then pulled to opposite poles due to the action of the meiotic spindle.
  • The separated chromatids are now individual chromosomes.

9. Telophase II and cytokinesis:

  • The chromosomes complete their move to the opposite poles of the cell.
  • At each pole of the cell a full set of chromosomes gather together.
  • A membrane forms around each set of chromosomes to create two new cell nuclei.
  • This is the last phase of meiosis, however cell division is not complete without another round of cytokinesis.
  • Once cytokinesis is complete there are four granddaughter cells, each with half a set of chromosomes (haploid):
    • in males, these four cells are all sperm cells
    • in females, one of the cells is an egg cell while the other three are polar bodies (small cells that do not develop into eggs).

Which of the following best describes cells that result from the process of meiosis in mammals?

Illustration showing the nine stages of meiosis.
Image credit: Genome Research Limited

This page was last updated on 2021-07-21

Which of the following describes cells that result from meiosis?

Which of the following best describes mitosis and meiosis result in daughter cells with different chromosomes? Mitosis produces two identical diploid daughter cells after one round of division. Meiosis produces four haploid daughter cells after two rounds of division.

Which of the following cells is formed by meiosis?

Meiosis is the type of cell division that creates egg and sperm cells. Mitosis is a fundamental process for life. During mitosis, a cell duplicates all of its contents, including its chromosomes, and splits to form two identical daughter cells.

Which of the following is a result of the process of meiosis quizlet?

The result of meiosis is 4 gametes, or sex cells, that each contain half of the genetic information in the parent organism.

What does meiosis in animal cells result in quizlet?

Meiosis - results in the production of four genetically unique haploid cells (half # of chromosomes as parent cell).