Help me understand this Biolog

timer Asked: Mar 3rd, 2016

Question description

Help me understand this Biology problem!

Sexual reproduction occurs in the bread mould (Neurospora crassa) when two haploid strains of different mating types come into contact with each other. The haploid cells fuse to form a diploid cell, which then undergoes meiosis to produce haploid spores. The spores are dispersed and grow into new fungal colonies as haploid individuals.

  In Neurospora, two genes participate in the synthesis of valine. The wild-type allele for one gene is designated val-1+ and a mutant allele designated val-1-. The second gene has a wild-type val-2+ allele and a mutant val-2- allele. These two genes are linked, with a map distance between them of 25%.

a. Progeny from the cross: val-1- val-2+  X  val-1+ val-2- are plated on minimal medium. What proportion of the progeny will grow on minimal medium? 

(So far I've made a table and I am seeing that 1/4 of the progeny grow on minimal media... but I'm really not sure about this.)

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