Which of the following represents the sequence of genetic stages in the sexual life cycle of a sac fungus, that is, the ploidy of the (1) zygote, (2) ascospores, (3) mycelia (after plasmogamy), and (4) zygote again?
A) Haploid, diploid, dikaryotic, haploid
B) Diploid, haploid, dikaryotic, diploid
C) Diploid, dikaryotic, haploid, diploid
D) Dikaryotic, diploid, haploid, dikaryotic
E) Haploid, dikaryotic, diploid, haploid

Question

Quizplus · Accepted Answer

In the sexual life cycle of a sac fungus, the sequence starts with a diploid zygote, which undergoes meiosis to produce haploid ascospores. These spores germinate into haploid mycelia. When two mycelia mate, their cells fuse in a process called plasmogamy, but their nuclei do not immediately fuse, resulting in a dikaryotic (n + n) stage. Eventually, karyogamy occurs, fusing the nuclei to form a new diploid zygote, completing the cycle.

Which of the Following Represents the Sequence of Genetic Stages