In Neurospora,the Genes His2 and Leu2 Are Closely Linked

question 7

Multiple Choice

In Neurospora,the genes his2 and leu2 are closely linked.From a cross,his2 × leu2,which is a rare octad of the following type,arose: his2, +
his 2. +
his 2. +
his 2, +
abort
abort
+, leu2
+, lou 2
This octad most likely arose by:

• A)crossover between his2 and leu2,followed by first-division nondisjunction.
• B)first-division nondisjunction.
• C)post-meiotic mitotic nondisjunction.
• D)rare triploidy.
• E)second-division nondisjunction.

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