Question

With respect to the fungal sexual cycle, choose the correct sequence of events.
a. Karyogamy, plasmogamy and meiosis
b. Meiosis, Plasmogamy and karyogamy
c. Plasmogamy, karyogamy and meiosis
d. Meiosis, karyogamy and plasmogamy

Answer 1

Hint: Sexual reproduction, a significant source of genetic variability, permits the fungus to familiarize themselves with new environments. The procedure of sexual reproduction amid the fungi is in many ways exclusive. The nucleus of the fungus turns pinched at its center point, and the diploid chromosomes are pulled separately by spindle fibers created within the integral nucleus.

Complete answer:
The steps of events take place in a fungal sexual cycle are: -
> Plasmogamy- In plasmogamy, the cytoplasm of two cells joins collectively with no fusion of nuclei. This course helps to carry the haploid nuclei in the same cell.

> Karyogamy- It is the combination of the nuclei. Karyogamy results in the arrangement of a zygote which is diploid.

> Meiosis- After the development of the zygote, meiosis (reduction division) begins. After the meiosis haploid stage of fungi gets recognized.

Thus the right series of events is plasmogamy, karyogamy, and meiosis.
Hence, the correct answer is option (C).

Additional information:
In most fungi, the zygote is the lone cell in the complete life cycle that is diploid. The dikaryotic state that results from plasmogamy is frequently a prominent condition in fungi and may be extended over several generations.

Note: In the inferior fungi, karyogamy generally follows plasmogamy almost straight away. In the more evolved fungi, however, karyogamy is estranged from plasmogamy. Once karyogamy has occurred, meiosis (cell division that decreases the chromosome amount to one pair per cell) generally follows and re-establish the haploid phase. The haploid nuclei that result from meiosis are normally included in spores called meiospores.