Biology, 06.01.2020 23:31 CheddaDsk

Saccharomyces cerevisiae is a diploid yeast species that can reproduce either sexually or asexually. an experiment was performed to induce mitotically dividing s. cerevisiae cells in g2 to undergo meiosis. which of the following best describes the steps these cells will follow to form gametes?

a. the first division will result in crossing over between homologous chromosomes, and the second division will reduce the original number of chromosomes by half in the daughter cells.
b. the first division will reduce the number of chromosomes by half for each daughter cell, and the second division will result in each daughter cell having one-fourth of the original number of chromosomes.
c. the first division will move single chromatids to each daughter cell, and the second division will double the number of chromosomes in each daughter cell.
d. the first division will reduce the number of chromosomes by half for each daughter cell, and the second division will move single chromatids to each daughter cell.

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The statement that best describes the steps these cells will follow to form gametes is "the first division will reduce the number of chromosomes by half for each daughter cell, and the second division will move single chromatids to each daughter cell"

MEIOSIS:

Meiosis is the process by which a single cell produces four daughter cells with a reduced number of chromosomes (by half). Meiosis occurs in two step division process namely: meiosis I and meiosis II. In meiosis I, homologous chromosomes are separated while in meiosis II, sister chromatids are separated. Meiosis I reduces the chromosome number by half i.e. from diploid (2n) to haploid (n). Therefore, in the experiment that was performed to induce mitotically dividing S. cerevisiae cells in G2 to undergo meiosis, the first division will reduce the number of chromosomes by half for each daughter cell, and the second division will move single chromatids to each daughter cell.

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Answer from: fansofboys

Meiosis is a reduction division in which number of chromosomes in the daughter cells are halved. In mitosis, the number of chromosomes in the daughter and parent cell are similar after cell division. The statement which describes the correct sequence is:

The first division will reduce the number of chromosomes by half for each daughter cell, and the second division will move single chromatids to each daughter cell.

The yeasts are the unicellular microorganisms that can reproduce sexually or asexually. During the sexual reproduction, the number of chromosomes in the in the daughter cells are halved. Some of the features of meiosis are:

Meiosis in yeasts produces four haploid daughter cells, known as gametes. Meiosis takes place in two steps, meiosis I and meiosis II. In meiosis I, the homologous chromosomes are separated, whereas, in the meiosis II separation of sister chromatids occur. Meiosis I is the reduction division in which diploid cell produces haploid cells. Thus, the experiment performed on yeast to induce mitosis will result in the cells undergoing meiosis during G1 phase. The first division will lead to reduction in the chromosome numbers by half and the second division will move single chromatids to each daughter cell.

Therefore, option D is correct.

To know more about cell division, refer to the following link:

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Answer from: Quest

climate change and pollution

Answer from: Quest

estuaries are the partially enclosed coastal bodies of brackish water formed at the mouth of sea where river meets an ocean. it is a transition zone between river and sea water so estuaries are influenced to both marine environment such as tides, waves and to riverine such as flow of fresh water and sediments. the mixing of sea and fresh water provide high level of nutrients, making estuaries a high product habitats.

many estuaries suffers degradation from a variety of human activities like erosion from deforestation, overgrazing, overfishing, drainage and eutrophication.

so from the above statement answers will be

1. false as estuaries are formed due to both brackish and freshwater.

2.true, due to high productivity estuaries are breeding ground for many marine species.

3. direct and indirect activities of man that contribute to pollution and deposition of sediments.

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