Sordaria fimicola is often used to demonstrate arrangement of colored ascospores within an ascus reflect meiotic divisions in which crossing over did or did not occur. The order of colored ascospores within an ascus indicates the order of gene segregation (of the different colored ascospores) during meiosis. For example, if you place wild type (black) S. fimicola with the mutant tan strain, there are three different possible hyphae fusions: 2 tan, 2 black, or 1 black and 1 tan (Fig. 9.3). Fusions between 2 tan or 2 black strains would result in ascospores of all one color that correspond to the color of the parent hyphae (Fig. 9.3a and 3b). When the parent hyphae are different colors (1 tan and 1 black), six ascospore color combinations are possible. When ascospore colors are arranged as shown in Fig. 9.3c, no crossing over occurred. These arrangements are called nonrecombinants. When recombination occurs, what do you think are the possible arrangements of the ascospores? Given the information provided above and in figure 9.3, draw the possible recombinant options below. You should have 4 total combination options.

Sordaria fimicola is often used to demonstrate arrangement of colored ascospores within an ascus reflect meiotic divisions in which crossing over did or did not occur. The order of colored ascospores within an ascus indicates the order of gene segregation (of the different colored ascospores) during meiosis. For example, if you place wild type (black) S. fimicola with the mutant tan strain, there are three different possible hyphae fusions: 2 tan, 2 black, or 1 black and 1 tan (Fig. 9.3). Fusions between 2 tan or 2 black strains would result in ascospores of all one color that correspond to the color of the parent hyphae (Fig. 9.3a and 3b). When the parent hyphae are different colors (1 tan and 1 black), six ascospore color combinations are possible. When ascospore colors are arranged as shown in Fig. 9.3c, no crossing over occurred. These arrangements are called nonrecombinants. When recombination occurs, what do you think are the possible arrangements of the ascospores? Given the information provided above and in figure 9.3, draw the possible recombinant options below. You should have 4 total combination options.

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Description: Sordaria fimicola is often used to demonstrate crossing over because thearrangement of colored ascospores within an ascus reflect meiotic divisions in whichcrossing over did or did not occur. The order of colored ascospores within an ascusindicates

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter24: Fungi

Section: Chapter Questions

Problem 1VCQ: Figure 24.14 Which of the following statements is true? A dikaryotic ascus that forms in the...

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