Cell Cycle And Cell Division Chapter-Wise Test 10

Correct answer Carries: 4.

Wrong Answer Carries: -1.

What happens to the chromosome number during meiosis I?

It remains diploid
It doubles
It reduces to haploid
It remains unchanged
3

During meiosis I, homologous chromosomes separate, reducing the chromosome number from diploid to haploid.

Which of the following occurs during anaphase I but not in mitotic anaphase?

Sister chromatids separate
Homologous chromosomes separate
Nuclear envelope reforms
Spindle fibers disappear
2

During anaphase I, homologous chromosomes separate, whereas in mitotic anaphase, sister chromatids separate.

Which of the following statements about prophase is correct?

Chromosomes decondense
Nuclear envelope remains intact
Centrosomes move to opposite poles
DNA replication occurs
3

During prophase, centrosomes migrate to opposite poles to form the mitotic spindle.

Which event occurs in anaphase II but not in anaphase I?

Homologous chromosomes separate
Sister chromatids separate
Nuclear membrane reforms
Chromosomes align at the equator
2

In anaphase II, sister chromatids separate, whereas in anaphase I, homologous chromosomes separate.

Which of the following is incorrect about crossing over in meiosis?

Crossing over occurs during pachytene of prophase I
It involves exchange of genetic material between homologous chromosomes
Crossing over leads to genetic recombination
Crossing over occurs during metaphase II
4

Crossing over occurs during pachytene of prophase I, not in metaphase II.

Which of the following is incorrect about meiosis?

Meiosis occurs in germ cells
Meiosis reduces the chromosome number by half
Meiosis consists of one round of division
Meiosis contributes to genetic variation
3

Meiosis consists of two rounds of division (meiosis I and meiosis II), not just one.

Which of the following statements about telophase I of meiosis is incorrect?

Nuclear envelope reforms around chromosomes
Cytokinesis may occur
DNA replication occurs before meiosis II
Chromosomes may decondense partially
3

There is no DNA replication between meiosis I and II.

What is the key difference between mitosis and meiosis?

Mitosis produces haploid cells, meiosis produces diploid cells
Mitosis occurs in gametes, meiosis occurs in somatic cells
Mitosis produces identical cells, meiosis results in genetic variation
Mitosis involves two cell divisions, meiosis involves one
3

Mitosis produces genetically identical cells, while meiosis introduces genetic variation through recombination.

Which stage of mitosis is best for studying chromosome morphology?

Prophase
Metaphase
Anaphase
Telophase
2

In metaphase, chromosomes are fully condensed and aligned at the equatorial plate, making them ideal for studying morphology.

Which of the following is incorrect about the G0 phase?

G0 is a resting phase where cells do not divide
Nerve and muscle cells remain in G0 permanently
All cells in G0 phase can never re-enter the cell cycle
G0 phase occurs after the G1 phase
3

Some cells in G0 can re-enter the cell cycle under specific conditions.

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