Difference between mitosis and meiosis
Meiosis
Mitosis
1-Take place in the germ cells.
2-Occurs only in sexually reproducing
organisms
3-There are two cell divisions, the first and
the second meiotic divisions.
4-Interphase precedes only in meiosis I. It
does not occur prior to meiosis II.
5-DNA replication takes place during
interphase I but not interphase II
6-The DNA replicates once for two cell
divisions
7-Prophase is comparatively longer and may
take days
8-Prophase is complicated and divided into
leptotene, zygotene, pachytene, diplotene,
and diakinesis
9-There is Synapsis of homologous
chromosomes
10-The two homologous chromosomes from
bivalents or tetrads. Each bivalents has four
chromatids and two centromers.
11-When prophase I commences the
chromosomes appear single, (although DNA
replication has taken place in interphase I).
12-Synapsed homologous chromosome
develop a
13-Crossing over..
14-There is no centromeric division during
anaphase I. Centromeres divide only during
anaphase II.
15-Short chromosomes separate early,
separation of long chromosome is delayed.
16-Spindle fibers do not disappear
completely in telophase I
17-Nucleoli do not reappear at telophase I.
1-Take place in the somatic cells of the body.
2-Occurs in both sexually as well as
asexually reproducing organisms
3-The cell divide only once.
4-Interphase occurs prior to each division
5-DNA replication takes place during
interphase I
6-The DNA replicates once for one cell
division.
7-The duration of prophase is short, usually
of a few hours.
8-Prophase is comparatively simple.
9-There is no synapsis
10-Each chromosomes consists of two
chromatids united by a centromere.
11-Chromosomes are already duplicated at
the beginning of prophase
12-A synaptionemal complex is absent
13- Crossing over is absent.
14-Division of the centromeres take place
during anaphase
15-The chromosomes separates
simultaneously during anaphase
16-Spindle fibers disappear completely in
telophase.
17-Nucleoli reappear at telophase.
ODAY ABDULQADER