Single Choice

Arrange the following events of meiosis in the correct sequence. (a) Crossing over (b) Synapsis (c) Terminalisation of chiasmata (d) Disappearance of nucleolus

A(b), (c), (d), (a)
B(b), (a), (d), (c)
C(b), (a), (c), (d)
Correct Answer
D(a), (b), (c), (d)

Solution

In meiosis, the following processes occur in sequential order:
Synapsis is the pairing of two homologous chromosomes that occurs during meiosis.
Chromosomal crossover (or crossing over) is the exchange of genetic material between homologous chromosomes that results in recombinant chromosomes during sexual reproduction.
The chiasmata are thought to be the points where two non-sister chromatids exchange genetic material during chromosomal crossover during meiosis The chiasmata become visible during the diplotene stage of prophase I of meiosis I, but the actual "crossing-over" of genetic material is thought to occur during the previous pachytene stage. When tetrads, which are composed of two pairs of sister chromatids, begin to split the only points of contact are at the chiasmata.
It is followed by disappearence of nucleolous.
So, the correct answer is option C.

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

During zygotene stage of meiosis in a spore mother cell, a proteinceous structure which appears between homologous chromosomes is known as.

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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