230983
Meiosis I and Meiosis II are characterised by the separation of
1 homologous chromosome; sister chromatids
2 sister chromatids; homologous chromosomes
3 centromere; telomere
4 telomere; centromere
Explanation:
A The process of meiosis is divided into two phases- Meiosis - I and Meiosis - II Meiosis-I \(\rightarrow\) Anaphase I \(\rightarrow\) In the two cells separation and distribution of homologous chromosome occur. Meiosis-II \(\rightarrow\) Anaphase II \(\rightarrow\) Separation of duplicated/sister chromatic occur in two cells.
[KVPY (SA)-2013]
Cell cycle and Cell Division
230985
In human females, meiosis-II is not completed until?
1 Birth
2 Puberty
3 Fertilization
4 Uterine implantation
Explanation:
C In human females, meiosis-II is not completed until fertilization. Secondary oocyte is arrested in metaphase-II until sperm contacts plasma membrane of the oocyte and complete meiosis-II. In oogenesis, the primary oocytes undergoes meiosis up to the interphase or upto prophase I (diakinesis). - The primary oocytes oocyte (2n) undergoes meiosis \(-\mathrm{I}\) to produce two haploid cells (n), larger one is called Secondary oocyte oocyte and the smaller one in \(1^{\text {st }}\) polar body. - Secondary oocyte undergoes the process of meiosis-II and proceeds upto metaphase II only. Completion of meiosis-II results in the formation of ovum and \(2^{\text {nd }}\) polar body.
[AIPMT (Re-Exam)-2015]
Cell cycle and Cell Division
230990
The meiosis is divided into two parts meiosis-I and II. The correct sequence of stages of cell division of meiotic-I, prophase is
B The correct stages of cell division - Leptotene \(\rightarrow\) Zygotene \(\rightarrow\) Pachytene \(\rightarrow\) Diplotene \(\rightarrow\) diakinesis. Leptotene:- The initialization of chromosomes condensation takes place. Zygotene:-The homologous chromosomes pair the process is called chromosomal synapsis. Pachytene:- Crossing over of non-sister chromatids of homologous chromosomes takes place. Diplotene:- It marks the synaptonemal complex dissolution and separation of homologous chromosome. Diakinesis:- Disappearance of nucleolus takes place.
[CMC Vellore-2015]
Cell cycle and Cell Division
230995
Identify the correct combination regarding Anaphase, Anaphase-I and Anaphase-II
1 Anaphase - centromere splits, Anaphase - I - Centromere splits, Anaphase - II Centromere splits
2 Anaphase - chromatids move to opposite poles; Anaphase - I - Homologous chromosomes separate; Anaphase - II- centromere splits.
4 Anaphase - chromosomes move to opposite poles; Anaphase - I - Homologous chromosomes separate, Anaphase - II - Centromere splits.
Explanation:
B Anaphase:- The spindle fibre splits the centromere and the chromatids move to opposite side of the cell. Anaphase-I:- The third stage of the \(\mathrm{I}^{\mathrm{st}}\) meiotic division after prophase-I. The separation of paired homologous chromosomes towards opposite ends of the cell. Anaphase -II:- It is same as the anaphase of mitosis, in which the centromere becomes half and chromosomes starts moving in opposite direction. After this, cytokinesis takes place.
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Cell cycle and Cell Division
230983
Meiosis I and Meiosis II are characterised by the separation of
1 homologous chromosome; sister chromatids
2 sister chromatids; homologous chromosomes
3 centromere; telomere
4 telomere; centromere
Explanation:
A The process of meiosis is divided into two phases- Meiosis - I and Meiosis - II Meiosis-I \(\rightarrow\) Anaphase I \(\rightarrow\) In the two cells separation and distribution of homologous chromosome occur. Meiosis-II \(\rightarrow\) Anaphase II \(\rightarrow\) Separation of duplicated/sister chromatic occur in two cells.
[KVPY (SA)-2013]
Cell cycle and Cell Division
230985
In human females, meiosis-II is not completed until?
1 Birth
2 Puberty
3 Fertilization
4 Uterine implantation
Explanation:
C In human females, meiosis-II is not completed until fertilization. Secondary oocyte is arrested in metaphase-II until sperm contacts plasma membrane of the oocyte and complete meiosis-II. In oogenesis, the primary oocytes undergoes meiosis up to the interphase or upto prophase I (diakinesis). - The primary oocytes oocyte (2n) undergoes meiosis \(-\mathrm{I}\) to produce two haploid cells (n), larger one is called Secondary oocyte oocyte and the smaller one in \(1^{\text {st }}\) polar body. - Secondary oocyte undergoes the process of meiosis-II and proceeds upto metaphase II only. Completion of meiosis-II results in the formation of ovum and \(2^{\text {nd }}\) polar body.
[AIPMT (Re-Exam)-2015]
Cell cycle and Cell Division
230990
The meiosis is divided into two parts meiosis-I and II. The correct sequence of stages of cell division of meiotic-I, prophase is
B The correct stages of cell division - Leptotene \(\rightarrow\) Zygotene \(\rightarrow\) Pachytene \(\rightarrow\) Diplotene \(\rightarrow\) diakinesis. Leptotene:- The initialization of chromosomes condensation takes place. Zygotene:-The homologous chromosomes pair the process is called chromosomal synapsis. Pachytene:- Crossing over of non-sister chromatids of homologous chromosomes takes place. Diplotene:- It marks the synaptonemal complex dissolution and separation of homologous chromosome. Diakinesis:- Disappearance of nucleolus takes place.
[CMC Vellore-2015]
Cell cycle and Cell Division
230995
Identify the correct combination regarding Anaphase, Anaphase-I and Anaphase-II
1 Anaphase - centromere splits, Anaphase - I - Centromere splits, Anaphase - II Centromere splits
2 Anaphase - chromatids move to opposite poles; Anaphase - I - Homologous chromosomes separate; Anaphase - II- centromere splits.
4 Anaphase - chromosomes move to opposite poles; Anaphase - I - Homologous chromosomes separate, Anaphase - II - Centromere splits.
Explanation:
B Anaphase:- The spindle fibre splits the centromere and the chromatids move to opposite side of the cell. Anaphase-I:- The third stage of the \(\mathrm{I}^{\mathrm{st}}\) meiotic division after prophase-I. The separation of paired homologous chromosomes towards opposite ends of the cell. Anaphase -II:- It is same as the anaphase of mitosis, in which the centromere becomes half and chromosomes starts moving in opposite direction. After this, cytokinesis takes place.
230983
Meiosis I and Meiosis II are characterised by the separation of
1 homologous chromosome; sister chromatids
2 sister chromatids; homologous chromosomes
3 centromere; telomere
4 telomere; centromere
Explanation:
A The process of meiosis is divided into two phases- Meiosis - I and Meiosis - II Meiosis-I \(\rightarrow\) Anaphase I \(\rightarrow\) In the two cells separation and distribution of homologous chromosome occur. Meiosis-II \(\rightarrow\) Anaphase II \(\rightarrow\) Separation of duplicated/sister chromatic occur in two cells.
[KVPY (SA)-2013]
Cell cycle and Cell Division
230985
In human females, meiosis-II is not completed until?
1 Birth
2 Puberty
3 Fertilization
4 Uterine implantation
Explanation:
C In human females, meiosis-II is not completed until fertilization. Secondary oocyte is arrested in metaphase-II until sperm contacts plasma membrane of the oocyte and complete meiosis-II. In oogenesis, the primary oocytes undergoes meiosis up to the interphase or upto prophase I (diakinesis). - The primary oocytes oocyte (2n) undergoes meiosis \(-\mathrm{I}\) to produce two haploid cells (n), larger one is called Secondary oocyte oocyte and the smaller one in \(1^{\text {st }}\) polar body. - Secondary oocyte undergoes the process of meiosis-II and proceeds upto metaphase II only. Completion of meiosis-II results in the formation of ovum and \(2^{\text {nd }}\) polar body.
[AIPMT (Re-Exam)-2015]
Cell cycle and Cell Division
230990
The meiosis is divided into two parts meiosis-I and II. The correct sequence of stages of cell division of meiotic-I, prophase is
B The correct stages of cell division - Leptotene \(\rightarrow\) Zygotene \(\rightarrow\) Pachytene \(\rightarrow\) Diplotene \(\rightarrow\) diakinesis. Leptotene:- The initialization of chromosomes condensation takes place. Zygotene:-The homologous chromosomes pair the process is called chromosomal synapsis. Pachytene:- Crossing over of non-sister chromatids of homologous chromosomes takes place. Diplotene:- It marks the synaptonemal complex dissolution and separation of homologous chromosome. Diakinesis:- Disappearance of nucleolus takes place.
[CMC Vellore-2015]
Cell cycle and Cell Division
230995
Identify the correct combination regarding Anaphase, Anaphase-I and Anaphase-II
1 Anaphase - centromere splits, Anaphase - I - Centromere splits, Anaphase - II Centromere splits
2 Anaphase - chromatids move to opposite poles; Anaphase - I - Homologous chromosomes separate; Anaphase - II- centromere splits.
4 Anaphase - chromosomes move to opposite poles; Anaphase - I - Homologous chromosomes separate, Anaphase - II - Centromere splits.
Explanation:
B Anaphase:- The spindle fibre splits the centromere and the chromatids move to opposite side of the cell. Anaphase-I:- The third stage of the \(\mathrm{I}^{\mathrm{st}}\) meiotic division after prophase-I. The separation of paired homologous chromosomes towards opposite ends of the cell. Anaphase -II:- It is same as the anaphase of mitosis, in which the centromere becomes half and chromosomes starts moving in opposite direction. After this, cytokinesis takes place.
230983
Meiosis I and Meiosis II are characterised by the separation of
1 homologous chromosome; sister chromatids
2 sister chromatids; homologous chromosomes
3 centromere; telomere
4 telomere; centromere
Explanation:
A The process of meiosis is divided into two phases- Meiosis - I and Meiosis - II Meiosis-I \(\rightarrow\) Anaphase I \(\rightarrow\) In the two cells separation and distribution of homologous chromosome occur. Meiosis-II \(\rightarrow\) Anaphase II \(\rightarrow\) Separation of duplicated/sister chromatic occur in two cells.
[KVPY (SA)-2013]
Cell cycle and Cell Division
230985
In human females, meiosis-II is not completed until?
1 Birth
2 Puberty
3 Fertilization
4 Uterine implantation
Explanation:
C In human females, meiosis-II is not completed until fertilization. Secondary oocyte is arrested in metaphase-II until sperm contacts plasma membrane of the oocyte and complete meiosis-II. In oogenesis, the primary oocytes undergoes meiosis up to the interphase or upto prophase I (diakinesis). - The primary oocytes oocyte (2n) undergoes meiosis \(-\mathrm{I}\) to produce two haploid cells (n), larger one is called Secondary oocyte oocyte and the smaller one in \(1^{\text {st }}\) polar body. - Secondary oocyte undergoes the process of meiosis-II and proceeds upto metaphase II only. Completion of meiosis-II results in the formation of ovum and \(2^{\text {nd }}\) polar body.
[AIPMT (Re-Exam)-2015]
Cell cycle and Cell Division
230990
The meiosis is divided into two parts meiosis-I and II. The correct sequence of stages of cell division of meiotic-I, prophase is
B The correct stages of cell division - Leptotene \(\rightarrow\) Zygotene \(\rightarrow\) Pachytene \(\rightarrow\) Diplotene \(\rightarrow\) diakinesis. Leptotene:- The initialization of chromosomes condensation takes place. Zygotene:-The homologous chromosomes pair the process is called chromosomal synapsis. Pachytene:- Crossing over of non-sister chromatids of homologous chromosomes takes place. Diplotene:- It marks the synaptonemal complex dissolution and separation of homologous chromosome. Diakinesis:- Disappearance of nucleolus takes place.
[CMC Vellore-2015]
Cell cycle and Cell Division
230995
Identify the correct combination regarding Anaphase, Anaphase-I and Anaphase-II
1 Anaphase - centromere splits, Anaphase - I - Centromere splits, Anaphase - II Centromere splits
2 Anaphase - chromatids move to opposite poles; Anaphase - I - Homologous chromosomes separate; Anaphase - II- centromere splits.
4 Anaphase - chromosomes move to opposite poles; Anaphase - I - Homologous chromosomes separate, Anaphase - II - Centromere splits.
Explanation:
B Anaphase:- The spindle fibre splits the centromere and the chromatids move to opposite side of the cell. Anaphase-I:- The third stage of the \(\mathrm{I}^{\mathrm{st}}\) meiotic division after prophase-I. The separation of paired homologous chromosomes towards opposite ends of the cell. Anaphase -II:- It is same as the anaphase of mitosis, in which the centromere becomes half and chromosomes starts moving in opposite direction. After this, cytokinesis takes place.
