Which of the following occurs only in meiosis?Pairing of hom*ologous chromosomes.Separation of duplicated strand.Cytokinesis.Disappearance of nucleolus. (2024)

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Which of the following occurs only in meiosis?Pairing of hom*ologous chromosomes.Separation of duplicated strand.Cytokinesis.Disappearance of nucleolus.? ›

So, the correct answer is 'Pairing of hom*ologous chromosomes. '

Pairing of hom*ologous chromosomes is called synapsis. Synapsis occurs only during meiosis.

The tight pairing of the hom*ologous chromosomes is called synapsis. In synapsis, the genes on the chromatids of the hom*ologous chromosomes are aligned with each other.

The events that occur in meiosis but not mitosis include hom*ologous chromosomes pairing up, crossing over, and lining up along the metaphase plate in tetrads.

During meiosis one cell divides twice to form four daughter cells. These four daughter cells only have half the number of chromosomes of the parent cell – they are haploid. Meiosis produces our sex cells or gametes – egg and sperm cells.

Prophase I: The hom*ologous chromosomes line up together. During this time, a process that only happens in meiosis can occur. This process is called crossing over (Figure below), which is the exchange of DNA between hom*ologous chromosomes. Crossing over forms new combinations of alleles on the resulting chromosome.

- Crossing over only occurs in Meiosis.

During meiosis I, hom*ologous chromosomes are separated. Subsequently, during meiosis II, the sister chromatids separate to produce a total of four products, each with half the number of chromosomes as the original cell.

Synapsis. Synapsis is the pairing of two hom*ologous chromosomes that occur during meiosis. This takes place during the prophase stage of meiosis I. When hom*ologous chromosomes pair, the hom*olouges cross over and exchange genetic material at certain points.

Meiosis involves pairing of hom*ologous chromosomes and recombination between them.

What is the occurrence of meiosis? ›

Meiosis occurs in the primordial germ cells, cells specified for sexual reproduction and separate from the body's normal somatic cells. In preparation for meiosis, a germ cell goes through interphase, during which the entire cell (including the genetic material contained in the nucleus) undergoes replication.

Meiosis is a process that occurs in sex cells, such as sperm and egg cells in the human body, to make more of them. In the primordial germ cells of males and females, meiosis takes place in the testes and ovaries, respectively.

In meiosis 1 the hom*ologous chromosomes separate from each other, whereas, in meiosis 2 the sister chromatids separate. In meiosis 1 two diploid daughter cells are produced, whereas, in meiosis 2 four haploid daughter cells are produced.

So, the correct answer is 'Pairing of hom*ologous chromosomes. '

Meiosis occurs in Anther. In plants, meiosis occurs in the anthers to form pollen grains that is the male gamete, and within the ovary to form ovules. In meiosis a diploid cell divides in such a way so as to produce four haploid cells. These haploid cells form gametes.

hom*ologous chromosomes are chromosome pairs of approximately the same length, centromere position, and staining pattern, with genes for the same characteristics at corresponding loci. One hom*ologous chromosome is inherited from the organism's mother; the other from the organism's father.

Final answer:

The pairing of hom*ologous chromosomes is the only event listed that happens once during meiosis. It takes place in Prophase I, allowing for the process of crossing over.

Like mitosis, meiosis also has distinct stages called prophase, metaphase, anaphase, and telophase. A key difference, however, is that during meiosis, each of these phases occurs twice — once during the first round of division, called meiosis I, and again during the second round of division, called meiosis II.

Unlike mitosis, meiosis is involved in reducing the chromosome number by half to produce gametes, introducing genetic variability through mechanisms like crossing over. Therefore, functions like creating genetic variability or reducing the chromosome number are exclusive to meiosis, not mitosis.

Meiosis only occurs in reproductive cells, as the goal is to create haploid gametes that will be used in fertilization. Meiosis is important to, but not the same as, sexual reproduction. Meiosis is necessary for sexual reproduction to occur, as it results in the formation of gametes (sperm and eggs).