Solutions For An Introduction to Genetic Analysis Chapter 3 Problem 39P

A mutant strain stopper [stp] exhibits erratic stop-and-start growth in Neurospora. For the first cross, we use a stopper strain as the mother and a wild type plant as the father to get progeny. All the progeny have the mutation of stopper growth.

Parents:

Progeny: all stopper.

In the reciprocal cross, we use a wild type female as the mother and a stopper strain as the father. All the progeny are normal.

Parents:

Progeny: all wild type.

a) The results of the progeny show that the inheritance is from a specific cytoplasmic organelle. Since Neurospora is a fungus, it does not contain chloroplasts and hence the location of this mutation is in the mitochondrion.