University:
Wilkes University
Course:
BIO 113 | Microbiology
Academic year:

2023
Views:

295

Pages:

2
Author:

cornaidqbf46

Sordaria Meiosis Lab Sample of Sordaria in petri dish Crossing-over in Sordaria sp. When mycelia of these two different strains come together and undergo meiosis, the asci that develop will contain four black ascospores and four tan ascospores. • • • • • Sordaria fimicola is an ascomycete fungus Sordaria is a haploid (n) organism for most of its life cycle. When the mycelium from two individuals meet, a diploid zygote (2n) is formed. The diploid zygote then undergoes meiosis to yield 8 haploid ascospores. These ascospores exist in a narrow pod called an ascus (plural, asci). Many asci will grow together forming a reproductive structure called a perithecium. When ascospores are mature the ascus ruptures, releasing the ascospores. Each ascospore can develop into a new haploid fungus. Sample of all black spores • • To the right is a photo of asci that resulted from a cross between two black strains that is both parental strains had black colored spores All of the 8 asci spores are black Sample of tan spores • • To the right is a photo of asci that resulted from a cross between two tan parental strains. All of the 8 asci spores are tan. Black and tan cross • • • To the right is a photo of asci that resulted from a cross between black and tan strains. Some asci have 4 black spores and then 4 tan (4:4) Some asci display a 2:4:2 or 2:2:2:2 sequence

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