Mitosis and Meiosis?

Question

Compare and contrast the events that occur during prophase of meiosis I and prophase of mitosis and anaphase I of meiosis and anaphase of mitosis.

Answer 1

PROPHASE:
Mitosis:
Prophase – very active phase of cell reproduction
• Centrioles in the cytoplasm split and start moving in opposite direction
• As they move they lay tracts of fibers known as Arterial ray, spindle fibers, or traction fibers
• The nucleolus disappears
• Nuclear membrane disintegrates
• Chromosomes become short, fat and thick
• Each chromosome divides into two chromatides held together by a centromere

Meiosis 1:
Same except for- Prophase I, crossing over can occur here – the exchange of DNA between non-sister chromatids

ANAPHASE
Mitosis:
Anaphase – chromatid centromere replicates and the Kinetochore splits
• Each chromatid starts toward the opposite end of the cell along the spindle fibers laid down by the centioles
Meiosis 1:
Exact same as Mitosis

Answer 2

first meisosis only occur in gamete cells(sex cells) and mitosis occurs in all the other cells of the body.

prophase of mitosis: pairing of the chromosomes

prophase of meiosis: pairing of the chromosomes

anaphase of mitosis:paired chromosomes separate and begin moving to opposite ends of the cell.

anaphase of meiosis:Chromosomes move to the opposite cell poles but they stay together

Answer 3

Prophase:
Same... chromatin condenses into chromosomes; spindle forms; nucleolus and nuclear envelope disintegrate.
Different ... In mitosis, the chromosomes are just randomly arranged in the cell. In meiosis I, the homologous chromosomes synapse and crossing over occurs.

Anaphase:
Same ... spindle fibers pull *something* to opposite poles.
Different ... In mitosis, the spindle pulls on the centromeres of each individual chromosome, splitting the centromeres and pulling sister chromatids to opposite poles. In meiosis I, the spindle pulls on the synapsed pairs of homologous chromosomes, pulling one entire double-stranded chromosome of each pair to each pole.

Answer 4

Mitosis: duplication of the chromosomes. in order to separate and multiply.
(from Wikipedia: Mitosis is the process by which a cell duplicates the chromosomes in its cell nucleus, in order to generate two, identical, daughter nuclei. It is generally followed immediately by cytokinesis, which divides the nuclei, cytoplasm, organelles and cell membrane into two daughter cells containing roughly equal shares of these cellular components. Mitosis and cytokinesis together define the mitotic (M) phase of the cell cycle, the division of the mother cell into two daughter cells, each with the genetic equivalent of the parent cell.)
Meiosis: where the cell splits, and needs another cell from the opposite sex to make it whole again.
(this is our method of reproductrion!)
(from wikipedia:In biology, meiosis (pronounced my-oh-sis) is the process by which one diploid eukaryotic cell divides to generate four haploid cells often called gametes. The word "meiosis" comes from the Greek meioun, meaning "to make smaller," since it results in a reduction in chromosome number in the gamete cell.)

there you have it ~_^