2 . In Neurospora, the cross a + x + b yielded only two types of ordered tetrads in approximately equal number. What can be concluded? Spore Pair 1 - 2 3 - 4 5 - 6 7 - 8 Tetrad Type 1 a + a + + b + b Tetrad Type 2 + + + + a b a b
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Neurospora of genotype a + c are crossed with Neurospora of genotype + b +. The following tetrads are obtained (note that the genotype of the four spore pairs in an ascus are listed, rather than listing all eight spores). Hint: The way to approach this problem is to just analyze two genes at a time. For example, when asked a question about a and b, ignore the data for c.
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Neurospora of genotype $a+c$ are crossed with Neurospora of genotype $+b+.$ (Here, $+$ is shorthand for the wild-type allele.) The following tetrads are obtained (note that the genotype of the four spore pairs in an ascus are listed, rather than listing all eight spores): a. In how many cells has meiosis occurred to yield these data? b. Give the best genetic map to explain these results. Indicate all relevant genetic distances, both between genes and between each gene and the centromere. c. Diagram a meiosis that could give rise to one of the three tetrads in the class at the far right in the list.
The following classes and frequencies of ordered tetrads were obtained from the cross a+ b+ x a b in Neurospora. (Only one member of each pair of spores is shown.) What is the order of the genes in relation to the centromere?
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