Cell Cycle and Cell Division

The primary significance of meiosis is:

1. Increase in chromosome number
2. Production of identical daughter cells
3. Genetic variation and maintenance of chromosome number across generations
4. Formation of body tissues

Which process is responsible for maintaining chromosome number in somatic cells?

1. Meiosis
2. Fertilization
3. Mitosis
4. Crossing over

Which checkpoint ensures that DNA replication is complete before mitosis begins?

1. G1 checkpoint
2. G2 checkpoint
3. Metaphase checkpoint
4. Telophase checkpoint

How many daughter cells are produced after one complete meiotic division?

1. One
2. Two
3. Three
4. Four

The stage in which nuclear envelope and nucleolus reappear is:

1. Prophase
2. Metaphase
3. Telophase
4. Anaphase

Synapsis refers to:

1. Separation of sister chromatids
2. Pairing of homologous chromosomes
3. DNA replication
4. Cytoplasmic division

Crossing over occurs during:

1. Leptotene
2. Zygotene
3. Pachytene
4. Diplotene

Meiosis reduces the chromosome number from:

1. Haploid to diploid
2. Diploid to haploid
3. Haploid to tetraploid
4. Diploid to tetraploid

Which phase immediately follows metaphase in mitosis?

1. Prophase
2. Telophase
3. Anaphase
4. Interphase

The division of cytoplasm following nuclear division is called:

1. Karyokinesis
2. Cytokinesis
3. Synapsis
4. Crossing over

Which event occurs during prophase of mitosis?

1. Chromosomes move to opposite poles.
2. Nuclear envelope reappears.
3. Chromatin condenses into chromosomes.
4. Cytokinesis is completed.

During which phase of mitosis do sister chromatids separate?

1. Prophase
2. Metaphase
3. Anaphase
4. Telophase

The stage of mitosis in which chromosomes align at the equatorial plate is:

1. Prophase
2. Metaphase
3. Anaphase
4. Telophase

The longest phase of the cell cycle is:

1. Prophase
2. Metaphase
3. Interphase
4. Telophase

Which phase of the cell cycle is primarily responsible for DNA replication?

1. G1 phase
2. S phase
3. G2 phase
4. M phase