Two Albino Strains of Neurospora Are Crossed

question 24

Essay

Two albino strains of Neurospora are crossed.Of 200 progeny,195 are albino and 5 are wild type (orange).Each parent,when mated with wild type,gives 1/2 wild-type and 1/2 albino progeny.
a)How can you tell that the two mutations involved here represent different genes?
b)What is your best estimate of map distance between the two mutations and how did you calculate it?

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