Genetics Crosses

Genetics as it applies to evolution, molecular biology, and medical aspects.

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Joined: Wed Oct 05, 2011 8:50 pm

Genetics Crosses

Post by Steven7373 » Wed Oct 05, 2011 8:53 pm

This is a question from a practice exam for our exam tomorrow morning. Please help I have been staring at this for an hour and cant figure it out.

You have two strains of Chlamydomonas. One is mt+ mating type, is sensitive to Drug A and resistant to Drugs B and
C. The other is mt- mating type, resistant to Drug A, and sensitive to Drugs B and C. You crossed the two strains and
analyzed 100 progeny. Predict the results of the cross assuming that sensitivity/resistance to Drug B is due to a nuclear
gene 10 map units away from the mating type gene (mt), sensitivity/resistance to Drug A is due to a chloroplast gene,
and sensitivity/resistance to Drug C is due to a mitochondrial gene. Note that Chlamydomonas mitochondria and
chloroplasts are inherited from parents of opposite mating types.

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