How can you tell where a mulling between the wild black strain (+) and the mutan

Question

How can you tell where a mulling between the wild black strain (+) and the mutant tan strain (-) took place? What is an ascus? What is a perithecium? in the table below, record the number of asci with spores all of one color (indicating that the zygote was formed by fusion of cells of the same strain), black and tan spores with crossover absent, and black and tan spores with crossover present. What percentage of asci observed resulted from fusion of cells from different strains? What percentage of those resulting from the fusion of different strains demonstrates crossovers?

Explanation / Answer

2)Ascus is a sexual spore-bearing cell. It is produced by ascomycete fungi. The Asci generally contain 8 ascospores. They are nonmotile , lack septum(coenocytic) and single celled.

3) Perithecium is the fruiting structure of fungi. It is globus or flask shaped, minute structure enclosing the asci. It is more or less completely closed.

1) The result from the mating of a black strain and a tan mutant strain will produce the offspirng that might have the intermediate phenotype.

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