A cell at telophase stage is observed by a student in a plant brought from the field. He tells his teacher that his cell is not like other cells at telophase stage. There is no formation of cell plate and thus the cell is containing more number of chromosomes as compared to other dividing cells. This would result in

(a) polyploidy

(b) somaclonal variation

(c) polyteny

(d) aneuploidy

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Which of the following is not a characteristic feature during mitosis in somatic cells
(a) Disappearance of nucleolus
(b) Chromosome movement
(c) Synapsis
(d) Spindle fibres

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Spindle fibres attach on to 

(a) Kinetochore of the chromosome
(b) centromere of the chromosome
(c) Kinetosome of the chromosome
(d) telomere of the chormosome 

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In meiosis crossing over is initiated at 

(a) leptotene
(b) Zygotene
(c) diplotene
(d) pachytene

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Arrange the following events of meiosis in correct sequences

I. Crossing Over

II. Synapsis

III. terminalisation of chaismata

IV. Disapperance of nucleolus

(1) II, I, IV, III

(2) II, I, III, IV

(3) I, II, III, IV

(4) II, III, IV, I

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The chromosomes in which centromere is situated close to one end are

(a) metacentric                (b) acrocentric

(c) telocentric                  (d) sub-metacentric

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A somatic cell that has just completed the S-phase of its cell cycle, as compared to gamete of the same species has

(a) twice the number of chromosomes and twice the amount of DNA
(b) same number of chromosomes but twice the amount of DNA
(c) twice the number of chromosomes and four times the amount of DNA
(d) four times the number of chromosomes andtwice the amount of DNA

 

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During which phase(s) of cell cycle, amount of DNA in a cell remains at 4C level if the inital amount is denoted as 2C?
(a) G0 and G1
(b) G1 and S
(c) Only G2
(d) G2 abd M

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In S-phase of the cell cycle 

(a) amount of DNA doubles in each cell

(b) amount of DNA remains same in each cell

(c) chromosome number is increased

(d) amount of DNA is reduced to half in each cell

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The enzyme recombinase is required at which stage of meiosis?
(a) Pachytene
(b) Zygotene
(c) Diptotene
(d) Diakinesis

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