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
DoubtBuddy
Single Choice
During zygotene stage of meiosis in a spore mother cell, a proteinceous structure which appears between homologous chromosomes is known as.
AHistone complex
BLysosomal complex
CLiposomal complex
DSynaptonemal complex
Correct Answer
Solution
The synaptonemal complex forms during the early stages of meiotic prophase I zygotene, when it mediates the pairing of homologous chromosomes.
Synaptonemal complex in chromosome synapsis and genetic recombination plan an important role. The synaptonemal complex is a proteinaceous structure and is thought to mediate synapsis and recombination during meiosis I of eukaryotic cell division.
So, the correct option is 'D'.
SIMILAR QUESTIONS
Cells - The Unit of Life
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
Cells - The Unit of Life
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.
Cells - The Unit of Life
Describe the following : (a) Synapsis (b) Bivalent (c) Chiasmata Draw a diagram to illustrate your answer
Cells - The Unit of Life
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
Cells - The Unit of Life
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.
Cells - The Unit of Life
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
Cells - The Unit of Life
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
Cells - The Unit of Life
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?
Cells - The Unit of Life
The diagram shows a bivalent at prophase-I of meiosis. Which of the four chromatids can cross over?
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