Centromere is required for
1. Crossing over
2. Transcription
3. Cytoplasmic cleavage
4. Movement of chromosomes towards poles
Spindle fibres attach on to:
1. Kinetosome of the chromosome
2. Telomere of the chromosome
3. Kinetochore of the chromosome
4. Centromere of the chromosome
After meiosis I, the resultant daughter cells have
1. | same amount of DNA as in the parent cell in S |
2. | twice the amount of DNA in comparison to haploid |
3. | same amount of DNA in comparison to haploid gamete |
4. | four times the amount of DNA in comparison to haploid gamete |
Crossing over takes place between which chromatids and in which stage of the cell cycle?
1. | Non-sister chromatids of non-homologous chromosomes at Zygotene stage of prophase I. |
2. | Non-sister chromatids of homologous chromosomes at Pachytene stage of prophase I. |
3. | Non-sister chromatids of homologous chromosomes at Zygotene stage of prophase I. |
4. | Non-sister chromatids of non-homologous chromosomes at Pachytene stage of prophase I. |
Which of the following is the correct sequence of events of interphase:-
a. cells metabolically active
b. Duplication of the chromosome but chromosome number remains constant
c. M phased
d. Synthesis of protein [Tubulin]
1.
2.
3.
4.
Which of the following is characteristic of prophase I of meiosis I:-
1. Synapsis in zygotene, genetically different chromatid are seen in pachytene
2. Exchange of genes in leptotene, genetically similar chromatids are seen in zygotene.
3. Chiasmata are present in metaphase
4. Splitting of centromere in anaphase-I
The correct sequence of phases in cell cycle is:
1.
2.
3.
4.
Cells in phase:
1. terminate the cell cycle
2. exit the cell cycle
3. enter the cell cycle
4. suspend the cell cycle
1. Cell of lateral meristem
2. Cells of apical meristem
3. Microsporocytes
4. Microspores and anther wall