Question

The Life cycle of Saccharomyces cerevisiae is
(A) Haplontic
(B) Diplontic
(C) Haplodiplontic
(D) None of the above

Answer 1

Here both haploid and diploid stages are multicellular. In some, the gametophyte is dominant and free-living and the sporophyte is a small and short-lived phase, which depends on gametophytes.

Complete answer:
The life cycle of Saccharomyces cerevisiae is represented by both haploid and diploid phases. Two types of yeast cells can survive and grow haploid and diploid. The haploid cells go through a simple life cycle of mitosis and growth, and subordinate situations of high stress will, generally, die. This is often the asexual sort of the fungus. The diploid cells (the special 'form' of yeast) likewise go through an easy life cycle of mitosis and growth. The speed at which the mitotic cell cycle goes often varies substantially between haploid and diploid cells. Under conditions of stress, diploid cells can go through sporulation, entering meiosis, and make four haploid spores, which may later mate. This is often the sexual kind of fungus. Under ideal conditions, yeast cells can double their population every 100 minutes. Although, growth rates differ enormously both between strains and between environments. The mean replicative lifespan is about 26 cell divisions.
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Therefore, the correct answer option (C) is ‘Haplodiplontic’.

Additional Information:
Yeast has two mating types, a and α (alpha), which exhibit primitive features of sex differentiation. As in many other eukaryotes, mating results in genetic recombination, i.e. production of novel combinations of chromosomes. Two haploid yeast cells of opposite mating type can mate to make diploid cells which will either sporulate to make another generation of haploid cells or still live as diploid cells. Mating has been exploited by biologists as a tool to mix genes, plasmids, or proteins at will. The kinds of life cycle patterns are seen within the Saccharomyces (yeasts).

Note: Saccharomyces cerevisiae is additionally known by its more common names, brewer's yeast or brewer's yeast. In nature, yeast cells are found totally on ripe fruits like grapes. Many proteins essential in human biology were primarily found through observing their homologs in yeast; these proteins comprise cell cycle proteins, signaling proteins, and protein-processing enzymes. S. cerevisiae is presently the only yeast cell well known to have Berkeley bodies present, which are involved, especially secretory pathways.