Analyse
the events during every stage of cell cycle and notice how the
following two parameters change
(i)
Number of chromosomes (N) per cell
(ii)
Amount of DNA content (C) per cell
Analyse the events during every stage of cell cycle and notice how the following two parameters change
(i) Number of chromosomes (N) per cell
(ii) Amount of DNA content (C) per cell
During meiosis, the
number of chromosomes and the amount of DNA in a cell change.
(i)
Number
of chromosomes (N) per cell
During anaphase I
of the meiotic cycle, the homologous chromosomes separate and start
moving toward their respective poles. As a result, the bivalents get
divided into two sister chromatids and receive half the chromosomes
present in the parent cell. Therefore, the number of chromosomes
reduces in anaphase I.
(ii)
Amount
of DNA content (C) per cell
During anaphase II
of the meiotic cycle, the chromatids separate as a result of the
splitting of the centromere. It is the centromere that holds together
the sister chromatids of each chromosome. As a result, the chromatids
move toward their respective poles. Therefore, at each pole, a
haploid number of chromosomes and a haploid amount of DNA are
present.
During mitosis, the
number of chromosomes remains the same. The DNA duplicated in the S
phase gets separated in the two daughter cells during anaphase. As a
result, the DNA content (C) of the two newly-formed daughter cells
remains the same.
During meiosis, the number of chromosomes and the amount of DNA in a cell change.
(i) Number of chromosomes (N) per cell
During anaphase I of the meiotic cycle, the homologous chromosomes separate and start moving toward their respective poles. As a result, the bivalents get divided into two sister chromatids and receive half the chromosomes present in the parent cell. Therefore, the number of chromosomes reduces in anaphase I.
(ii) Amount of DNA content (C) per cell
During anaphase II of the meiotic cycle, the chromatids separate as a result of the splitting of the centromere. It is the centromere that holds together the sister chromatids of each chromosome. As a result, the chromatids move toward their respective poles. Therefore, at each pole, a haploid number of chromosomes and a haploid amount of DNA are present.
During mitosis, the number of chromosomes remains the same. The DNA duplicated in the S phase gets separated in the two daughter cells during anaphase. As a result, the DNA content (C) of the two newly-formed daughter cells remains the same.
