Question

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:

• (a) $\to$ (iii), (b) $\to$ (iv), (c) $\to$ (i), (d) $\to$ (ii)
• (a) $\to$ (iv), (b) $\to$ (iii), (c) $\to$ (ii), (d) $\to$ (i)
• (a) $\to$ (i), (b) $\to$ (ii), (c) $\to$ (iv), (d) $\to$ (iii)
• (a) $\to$ (ii), (b) $\to$ (iv), (c) $\to$ (iii), (d) $\to$ (i)

Answer 1

The Correct Option is B

Ans.

 

The second Prophase I stage is called zygotene. The process of synapsis is when chromosomes begin to couple up. 

Pachytene is the third prophase I stage, during which bivalent chromosomes are visible as tetrads and homologous chromosomes cross over.

Following pachytene, diplotene is the fourth stage of the prophase of meiosis, when the paired chromosomes start to divide into two pairs of chromatids and the chiasmata become apparent.

Diakinesis is the final and fifth stage of meiosis' prophase, coming after diplotene, when homologous chromosomes have completely separated from one another and crossed over. As the chiasmata migrate to the extremities of the tetrad, terminalization takes place.

The second stage of meiosis prophase-1 is called zygotene. It is preceded by the leptotene stage, during which chromosomes uncoil and condense.

Homologous chromosomes—one from the mother and one from the father—come together and couple during the zygotene stage. Synapsis is the biological term for the pairing of homologous chromosomes.

Synapsis is an extremely precise and precise procedure. Synapsis can begin at the centromere and move towards the end of the chromosome, or the other way around. Synapsis happens at several places in the random type.

A protein complex called the synaptonemal complex connects the paired chromosomes.

At this point, the homologous pair of chromosomes are referred to as tetrad or bivalent. The number of bivalents is equal to half of the original number of chromosomes in the cell. One chromosome from each parent can be found in each bivalent.

In the Pachytene stage, the synaptonemal complex enables crossing over or recombination while also stabilizing pairing.

Pachytene is the stage that comes after Zygotene. In the pachytene stage, the four chromatids of tetrads are plainly evident.

A protein complex called the synaptonemal complex connects the paired chromosomes.

The fourth step of the five-stage meiosis prophase-1 process is called diplotene. The crossing over during the pachytene stage comes before it. Desynapsis and chiasmata development are features of the diplotene stage.

Synaptonemal complexes that were generated during zygotene disintegrate in the diplotene stage, and homologous chromosomal desynapsis begins. Except for the places of crossing over known as chiasmata, homologous chromosomes are distinct from one another.

The final stage of the five-stage meiosis prophase-1 process is called diakinesis. Chiasmata terminalization is a characteristic of the diakinesis stage. The cell that is dividing reaches metaphase after diakinesis.