Biology
Cell Cycle and Chromosomes
1,348 Questions
Explore a curated list of questions covering the cell cycle, mitosis, and meiosis. Topics include DNA replication, chromosomal structures, and genetic disorders. This material is essential for students preparing for biology and general science competitive exams.
Cell cycle eventsDNA replicationMeiosis processChromosomal structuresGenetic disorders
Cell Cycle and Chromosomes Questions
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Chromosomes of the father
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Chromosomes of the mother
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RH factor of the parents
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Blood group of the father
C
Correct answer
Explanation
The endosperm is triploid (3n = 24), so n = 8. Somatic cells (like those in the stem) are diploid (2n), so 2 multiplied by 8 equals 16.
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Nomenclature method
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Taxonomy
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Karyotyping
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Palaeotaxonomy
C
Correct answer
Explanation
The characterisation and identification of a cell's complete chromosome set is referred to as karyotyping.
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Nomenclature method
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Palaeotaxonomy
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Taxonomy
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Cytotaxonomy
D
Correct answer
Explanation
In this method of taxonomy, karyotyping is the first stage in the process of using chromosomes in taxonomy.
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once in each cell
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twice in each cell
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thrice in each cell
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None of the above
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linkage
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crossing over
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recombination
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segregation
B
Correct answer
Explanation
Crossing over is the specific biological process where segments of DNA are exchanged between homologous chromosomes during prophase I of meiosis.
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metaphase
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prophase
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interphase
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None of the above
B
Correct answer
Explanation
Prophase is the first phase of mitosis, characterized by the condensation of chromatin into visible, thread-like chromosomes.
B
Correct answer
Explanation
The diploid chromosome number (2n) for common rice (Oryza sativa) is 24.
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chromonemata
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chromomere
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chiasmata
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None of these
C
Correct answer
Explanation
Chiasmata are the X-shaped regions where homologous chromosomes remain attached during prophase I of meiosis, marking the site where crossing over has occurred.
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plasmid
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nucleolus
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centromere
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karyolymph
B
Correct answer
Explanation
The nucleolus is a dense, spherical structure within the nucleus that is associated with the nucleolar organizer region of specific chromosomes.
A
Correct answer
Explanation
Sperm contains half the number of chromosomes.
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inhibition of chromosome replication
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increases cell division
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prevents the spindle formation
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inhibits metaphase
C
Correct answer
Explanation
Correct. These chemicals prevent the spindle formation during mitosis to allow replication of chromosomes.In the absence of the spindle anaphase is blocked.
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X chromosome
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Y chromosome
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DNA
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RNA
C
Correct answer
Explanation
DNA (deoxyribonucleic acid) is the molecule that carries genetic instructions for the development, functioning, growth, and reproduction of all known organisms.
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plasmotomy
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fragmentation
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multiple fission
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all of these
C
Correct answer
Explanation
Multiple fission at the cellular level occurs in many protists, e.g. sporozoans and algae. The nucleus of the parent cell divides several times by mitosis, producing several nuclei. The cytoplasm then separates, creating multiple daughter cells.
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more resistant to disease than their diploid counterparts
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useful material for studying the effect of mutations
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used to obtain homozygous plants for a number of traits
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all of the above
D
Correct answer
Explanation
Androgenic haploids are produced via anther or pollen culture. They are highly valuable in breeding because they can be doubled to create homozygous lines, are useful for mutation studies, and reveal recessive traits.