PrepBharat

1.Mitosis helps
a) Growth
b) Repair
c) Both (a) and (b)
d) None of these

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2. Which of the following holds true about meiosis?
I. It ensures the production of haploid phase in the life cycle of sexually reproducing organism where fertilization restores the diploid phase.
II. It involves the two sequential cycle of nuclear and cell division called meiosis I and II but only a single cycle of DNA replication.
III. It involves the pairing of homologous chromosomes and recombination between them.
IV. Four haploid cells are formed at the end of meiosis.
a) I, II, IV only
b) IV only
c) I and III only
d) All of these

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3. Prophase I is divided into how many phases based on the chromosomal behaviour?
a) 1
b) 2
c) 4
d) 5

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4. Synaptonemal complex formes in
a) Zygotene
b) Pachytene
c) Diplotene
d) Diakinesis

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5. Select the correct statement from the following:
a) In leptotene stage the chromosomes become gradually visible under light microscope.
b) During zygotene the heterologous chromosome shows pairing.
c) Chiasmata is a J-shape structure formed in diplotene.
d) Pachytene is characterized by the formation of synaptonemal complex.

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6. Recombination is seen in
a) Diplotene
b) Zygotene or synaptotene
c) Pachytene
d) Diakinesis

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7. Synaptonemal complex is visible in
a) Compound microscope
b) Simple microscope
c) Hand lens
d) Electron microscope

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8. Crossing over is an exchange of genetic material between
a) Homologous chromosome
b) Heterologus chromosome
c) Non-homologous chromosome
d) All of these

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9. The beginning of diplotene is characterized by
a) Recombination
b) Synapsis
c) Dissolution of synaptonemal complex
d) Formation of tetrad

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10. Diakinesis is characterized by
a) Condensation of chromosome
b) Assemblage of spindle
c) Disappearance of nucleous and nuclear membrane
d) All the above

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