Table : Differences between mitosis and meiosis
Mitosis Meiosis
- Occurs in somatic cells. Limited to the germinal cells.
- In mitosis each replication cycle of DNa is
followed by one cell division.
In Meiosis one replication cycle of DNa is followed by two
divisions.
- Daughter cells have diploid number of
chromosomes.
Daughter cells have haploid number of chromosomes.
- DNa synthesis occurs in the S-phase, which is
followed by a G 2 phase before onset of mitotic
division (M-phase).
G 2 phase is short or non-existent. Premeiotic DNa synthesis is
followed immediately by meiosis.
- every chromosome behaves independently. Homologous chromosomes become mechanically related (synapsis).
- Completed in 1 to 2 hours. Long process.
- No crossing over/genetic variability. Crossing over and hence genetic variability occurs.
- Mitotic anaphase differs from mitotic metaphase in
possessing
(a) same number of chromosomes and same number of
chromatids
(b) half number of chromosomes and half number of
chromatids
(c) half number of chromosomes and same number of
chromatids
(d) same number of chromosomes and half number of
chromatids.
- amitosis is
(a) division involving formation of chromosome bridges
(b) division involving spindle formation
(c) division in which chromosomes are equally distributed
(d) cleavage of nucleus without recognisable chromosome
distribution.
- as compared to mitosis, in meiosis
(a) two replication cycle of DNa is followed by two
divisions
(b) four diploid cells are formed
(c) every chromosome behaves independently
(d) genetic variabilities are introduced in daughter cells.
- Synaptonemal complex has a role in
(a) chromosome pairing
(b) chromosome movement
(c) chromosome segregation
(d) chromosome organisation.
- The number of chromosomes becomes half in
(a) anaphase I
(b) anaphase II
(c) telophase I
(d) telophase II.
- In which of the following stage, the chromosomes are thin
and like long threads?
(a) Leptotene (b) Zygotene
(c) Pachytene (d) Diplotene
- Explain the mechanism of crossing over.
- How is anaphase of mitosis different from anaphase I of meiosis?
