Attachment of spindle fibers to kinetochores of chromosomes becomes evident in :
1. Anaphase
2. Telophase
3. Prophase
4. Metaphase
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIn a mitotic cycle, the correct sequence of phases is
1. S, , , M
2. , S, , M
3. M, , , S
4. , , S, M
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyDuring Meiosis 1, in which stage synapsis takes place?
1. Pachytene
2. Zygotene
3. Diplotene
4. Leptotene
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyMatch the following events that occur in their respective phases of cell cycle and select the correct option :
(a) G 1 phase (i) Cell grows and organelle duplication
(b) S phase (ii) DNA replication and chromosome duplication
(c) G 2 phase (iii) Cytoplasmic growth
(d) Metaphase in M-phase (iv) Alignment of chromosomes
1. (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
2. (a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
3. (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
4. (a)-(iii), (b)-(ii), (c)-(i), (d)-(iv)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIdentify the meiotic stage in which the homologous chromosomes separate while the sister chromatids remain associated at their centromeres :
1. Metaphase-II
2. Anaphase-I
3. Anaphase-II
4. Metaphase-I
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAt metaphase, chromosomes are attached to the
spindle fibres by their :
1. Centromere
2. Satellites
3. Secondary constrictions
4. Kinetochores
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyCentromere is required for -
(1) Movement of chromosomes towards poles
(2) Cytoplasmic cleavage
(3) Crossing over
(4) Transcription
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhat occurs in crossing over :
1. Recombination
2. Mutation
3. Independent assortment
4. None
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyCrossing over that results in genetic recombination in higher organisms occurs between:-
1. Non-sister chromatids of a bivalent
2. Two daughter nuclei
3. Two different bivalents
4. Sister chromatids of a bivalents
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIn the somatic cell cycle :-
1. DNA replication takes place in S-phase
2. A short interphase is followed by a long mitotic phase
3. phase follows mitotic phase
4. In phase, DNA content is double the amount of DNA present in the original cell
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology