Podcast
Questions and Answers
During which stage do chromosomes become progressively visible?
During which stage do chromosomes become progressively visible?
The process of chromosome pairing during meiosis occurs in which stage?
The process of chromosome pairing during meiosis occurs in which stage?
What happens during the S phase of the cell cycle?
What happens during the S phase of the cell cycle?
Which phase of the cell cycle lasts the longest?
Which phase of the cell cycle lasts the longest?
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What are the paired chromosomes called during meiosis?
What are the paired chromosomes called during meiosis?
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What is the name given to the structure formed by a pair of synapsed homologous chromosomes?
What is the name given to the structure formed by a pair of synapsed homologous chromosomes?
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In which phase are chromosomes clearly observed?
In which phase are chromosomes clearly observed?
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What marks the start of the second phase of mitosis?
What marks the start of the second phase of mitosis?
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Which of the following statements about recombination during meiosis is true?
Which of the following statements about recombination during meiosis is true?
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Which stage of meiosis is characterized by the appearance of X-shaped structures?
Which stage of meiosis is characterized by the appearance of X-shaped structures?
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Which statement about the G₀ phase is true?
Which statement about the G₀ phase is true?
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In which of the following stages does nucleolus disappearance occur?
In which of the following stages does nucleolus disappearance occur?
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What is the significance of the G₂ phase?
What is the significance of the G₂ phase?
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Cytokinesis in animal cells occurs in which manner?
Cytokinesis in animal cells occurs in which manner?
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During which phase does cytokinesis occur?
During which phase does cytokinesis occur?
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What structure serves as the attachment site for spindle fibers?
What structure serves as the attachment site for spindle fibers?
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What is the primary role of the kinetochore during cell division?
What is the primary role of the kinetochore during cell division?
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During which stage of meiosis does crossing over primarily occur?
During which stage of meiosis does crossing over primarily occur?
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Which process is characterized by the complete disintegration of the nuclear envelope?
Which process is characterized by the complete disintegration of the nuclear envelope?
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What happens to bivalent chromosomes during metaphase?
What happens to bivalent chromosomes during metaphase?
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What indicates the sites where crossing over occurs in homologous chromosomes?
What indicates the sites where crossing over occurs in homologous chromosomes?
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Which stage of meiosis is characterized by the transition from a haploid set of chromosomes to two daughter cells?
Which stage of meiosis is characterized by the transition from a haploid set of chromosomes to two daughter cells?
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Which statement about Anaphase I is correct?
Which statement about Anaphase I is correct?
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What structure marks the end of prophase I in meiosis, characterized by visible chiasmata?
What structure marks the end of prophase I in meiosis, characterized by visible chiasmata?
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During which phase is no DNA replication expected?
During which phase is no DNA replication expected?
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In meiosis, what structure is referred to as a 'dyad'?
In meiosis, what structure is referred to as a 'dyad'?
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Which of the following describes the function of golgi complexes during cell division?
Which of the following describes the function of golgi complexes during cell division?
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What role do mutations play in evolution?
What role do mutations play in evolution?
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In which phase of meiosis do cells remain transient and can enter a state called G₀?
In which phase of meiosis do cells remain transient and can enter a state called G₀?
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Which phase of the cell cycle is primarily focused on protein synthesis in preparation for mitosis?
Which phase of the cell cycle is primarily focused on protein synthesis in preparation for mitosis?
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What is the correct sequence of stages during prophase of meiosis?
What is the correct sequence of stages during prophase of meiosis?
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Which of the following statements about centromeres is accurate?
Which of the following statements about centromeres is accurate?
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Study Notes
Cell Cycle and Cell Division
- Cell cycle is divided into two phases
- Interphase — lasts over 90% of cell cycle duration; M phase
- Interphase has three subphases: G1, S, G2
- DNA synthesis occurs during S phase
- There is an increase in chromosomes number in S phase
- In S phase, centriole duplication begins in the nucleus (TRUE/FALSE)
- G2 phase involves preparing the cell for mitosis
- Cells after completing the M phase enter the G0 phase
- G0 phase is also called the quiescent phase
- Cells can exit the cell cycle by entering the G0 phase
- The human cell divides once approximately every 24 hours
Phases of Cell Cycle
- The human cell divides once in approximately 24 hours.
- Cell cycle is divided into 2 phases: Interphase and M Phase.
- Interphase lasts more than 90% of the duration of the cell cycle (NEET).
- Interphase is divided into 3 sub-phases: G1, S, G2
- DNA synthesis takes place in S phase
- There is an increase in the number of chromosomes in S phase
- Onion cells have 16 chromosomes.
- Heart cells do not divide (TRUE/FALSE)
- Cells after completing the M phase enter the G0 phase (TRUE/FALSE)
M Phase
- M phase is the most dramatic period of the cell cycle
- It is also called the equational division
- Cytokinesis is a part of the M phase (TRUE/FALSE)
- The five phases of M phase are: Prophase, Metaphase, Anaphase, Telophase
- Prophase is marked by condensation of chromosomal material
- Two asters together with spindle fibres form the mitotic spindle
- Cell at end of prophase don't show 4 characteristic features
- Metaphase is marked by the initiation of condensation of chromosomal material.
- Two asters together with spindle fibres form the mitotic spindle
- What marks the start of the 2nd phase of mitosis?
Meiosis
- Prophase I is typically longer and more complex than prophase in mitosis
- Five phases of meiosis 1: Leptotene, Zygotene, Pachytene, Diplotene, Diakinesis
- Chromosomes become visible (gradually) in meiosis
- Paired chromosomes are called bivalent or a tetrads
- The complex formed by a pair of synapsed homologous chromosomes is called a bivalent, or tetrad.
- Meiosis results in the formation of four haploid daughter cells from one diploid cell
- Mitosis result in the formation of two diploid daughter cells
Additional Notes
- Chromosomes are clearly observed during the metaphase.
- Spindle fibres attach to kinetochores.
- The plane of alignment of the chromosomes at metaphase is called the metaphase plate.
- Chromosomes decondense and lose their individuality in telophase.
- Two daughter nuclei are formed in telophase.
- In animal cells, cytokinesis occurs centripetally.
- A contribution of mitosis is cell repair (True/False)
- No replication of DNA occurs during interkinesis (True/False)
- Dyads of cells are formed in Meiosis
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Description
Test your knowledge on the cell cycle and its phases, including Interphase and M phase. This quiz covers the duration, subphases, and key events like DNA synthesis. Dive deep into the details of G1, S, G2 phases, and the significance of the G0 phase.
