In which stage do the chromosomes appear as thin long thread a Leptotene B zygotene C prophase D pachytene?

In leptotene stage the chromosomes appear thin and long thread-like.

In which stage of meiosis the chromosome is thin?

The leptotene stage, also known as the leptonema, is the first of five substages of prophase I in meiosis. The term leptonema derives from Greek words meaning “thin threads”. A cell destined to become a gamete enters the leptotene stage after its chromosomes are duplicated during interphase.

What stage do chromosomes appear?

Metaphase. Next, chromosomes assume their most compacted state during metaphase, when the centromeres of all the cell’s chromosomes line up at the equator of the spindle. Metaphase is particularly useful in cytogenetics, because chromosomes can be most easily visualized at this stage.

When the chromosomes are thin they are called?

a) Leptotene- It is the beginning of the prophase and the chromosomes appear as thin long threads. The condensation of chromosome is still not done by this phase.

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What happens in Zygotene stage of meiosis?

Zygotene is the second stage of meiosis prophase-1. … In the zygotene stage, homologous chromosomes (one from mother and one from father) come together and pair. The process of the pairing of homologous chromosomes is known as synapsis. The process of synapsis is very specific and exact.

Which stage do chromosomes appear as thin long thread?

At the leptotene stage the chromosomes appear as long, thin threads.

Which stage do chromosomes appear thin and long thread-like?

In leptotene stage the chromosomes appear thin and long thread-like.

In which stage of mitosis the chromosomes are thickest thinnest?

Chromosomes are the thickest and shortest in the metaphase of mitosis. The chromatin starts condensing into chromosome from prophase onward and reach full condensation at metaphase.

Which of the following phases of prophase 1 is known for single threaded stage?

Ans: Leptotene is the first stage of the five substages of prophase I of meiosis I occurring in gametes. In this stage, the chromosomes condense and come together to form thin-thread like structures, each structure consisting of two replicated sister chromatids.

Are thin thread like structure that condense and form short thick chromosomes?

Answer: Chromatin condenses to form thicker thread like structure called Chromosome.

What are the 4 stages of the cell cycle?

In eukaryotes, the cell cycle consists of four discrete phases: G1, S, G2, and M. The S or synthesis phase is when DNA replication occurs, and the M or mitosis phase is when the cell actually divides. The other two phases — G1 and G2, the so-called gap phases — are less dramatic but equally important.

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What happens in leptotene stage?

During leptotene stage, chromosomes begin to condense; during zygotene stage, homologous chromosomes pair; and during pachytene stage, synapsis is complete and crossing-over and homologous recombination take place. Finally, during diplotene stage, chromosomes are unsynapsed and, subsequently, the cell divides.

What is bouquet stage?

During the leptotene stage of meiosis, the telomeres of all the chromosomes converge towards the nuclear membrane and assume the shape of a bouquet. Hence, the leptotene is called the Bouquet stage.

What is the zygotene stage?

The zygotene is the stage of prophase I that follows after leptotene and precedes pachytene. Prior to zygotene, the chromosomes start to condense into long strands inside the nucleus and the chromosomes appear as threadlike. Zygotene is that phase wherein the homologous chromosomes pair or come together in synapse.

Which of the following stage of M phase is considered as tetraploid stage?

Metaphase-II of meiosis.

How many bivalents are seen in zygotene when diploid cells have 20 chromosomes?

Explanation: how many bivalents are seen in zygotene when somatic/ diploid cell has 20 chromosomes? The answer is 30.