Cells - The Unit of Life
Arrange the following events of meiosis in the correct sequence. (a) Crossing over (b) Synapsis (c) Terminalisation of chiasmata (d) Disappearance of nucleolus
Match column I with column II and select the correct option from the given codes. Sr. no List I Sr.no List II A. Chromosomes move to equator 1. Pachytene B. Centromere splits and chromatids move apart 2. Zygotene C. Pairing between homologous chromosomes 3. Anaphase D. Crossing over between homologous chromosomes 4. Metaphase
Meiosis has the prophase stage which is the longest phase of karyokinesis otherwise. It is then divided into five different phases. Leptotene is the phase where the chromosomes are present as a long thread with chromomeres on it. Zygotene is the second stage where the pairing of synopsis of homologous chromosomes takes place here. In the stage. Pachytene is the stage where crossing over or exchange of segments between non-sister chromatids of homologous chromosomes takes place. Diplotene is the stage where the chromosome begins to separate and terminalization starts. Diakinesis is the stage where the nuclear membrane starts degeneration. Metaphase is the stage where the chromosomes arrange themselves on the metaphase plate. Anaphase is the place where he the separation of the chromosomes takes lace and disjunction takes place.
Thus, the correct answer is 'A-(iv), B-(iii), C-(ii), D-(i).'
Arrange the following events of meiosis in the correct sequence. (a) Crossing over (b) Synapsis (c) Terminalisation of chiasmata (d) Disappearance of nucleolus
Match the following with respect to meiosis (a) Zygotene (i) Terminalization (b) Pachytene (ii) Chiasmata (c) Diplotene (iii) Crossing over (d) Diakinesis (iv) Synapsis Select the correct option from the following
Name the stage of cell cycle at which one of the following events occur. (i) Chromosomes are moved to spindle equator. (ii) Centromere splits and chromatids separate. (iii) Pairing between homologous chromosomes takes place. (iv) Crossing over between homologous chromosomes takes place.
Describe the following : (a) Synapsis (b) Bivalent (c) Chiasmata Draw a diagram to illustrate your answer
Refer to the following statements describing Prophase I of meiosis and answer the question. (i) Thin thread like chromosomes with a beaded appearance (ii) Appearence of recombination nodules (iii) Formation of bivalents/tetrads (iv) Terminalisation of chiasmata (v) Appearance of chiasmata Identify the different stages with respect to the above given features and select the correct option
Refer to the following statements describing Prophase I of meiosis and answer the question. (i) Thin thread like chromosomes with a beaded appearance (ii) Appearence of recombination nodules (iii) Formation of bivalents/tetrads (iv) Terminalisation of chiasmata (v) Appearance of chiasmata Arrange the given statements in the correct sequence of their occurrence during prophase I.
Match column I with column II and select the correct option from the given codes. Sr.no List I Sr.no List II A. Synaptonemal complex 1. Pachytene B. Recombination nodule 2. Zygotene C. Terminalisation of chiasmata 3. Telophase I D. Formation of dyad cell 4. Diakinesis
Prophase of the first meiotic division is typically longer and complex. It is subdivided into $$5$$ phases: leptotene, zygotene, pachytene, diplotene and diakinesis. Which of the following statements is not correct of these phases?
During zygotene stage of meiosis in a spore mother cell, a proteinceous structure which appears between homologous chromosomes is known as.
The diagram shows a bivalent at prophase-I of meiosis. Which of the four chromatids can cross over?