Tutorial 7 guide

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Biology 2C03: Genetics Tutorial 7 – Organelle Inheritance Objectives:  Identify different organelle inheritance. Outline: During this tutorial you will solve organelle inheritance problems and explain the reason for your answer. Preparation To prepare for the tutorial you should:  Read: o Homoplasmy and Heteroplasmy (pg. 634 – 635) o Genome Replication in Organelles (pg. 635) o Replicative Segregation of Organelle Genomes (pg. 635 – 636) o 17.2 Modes of Organellar Inheritance Depend on the Organism (pg. 636 – 644) from Ch. 17 of “Genetic analysis – an integrated approach” textbook

Biology 2C03: Genetics Tutorial 7 – Organelle Inheritance 1. You have isolated (1) a streptomycin-resistant mutant ( str R ) of Chlamydomonas that maps to the chloroplast genome and (2) a hygromycin-resistant mutant ( hyg R ) of Chlamydomonas that maps to the mitochondrial genome. a) What types of progeny do you expect from the following reciprocal cross: mt + str R hyg S × mt − str S hyg R mt+ strR hygR, mt- strR hyg, mt+ strS hygS, mt-strS hygS b) What types of progeny do you expect from the following reciprocal cross: mt + str S hyg R × mt − str R hyg S mt + strS hyg S: mt - strS hyg S 2. You are a genetic counselor, and several members of the family whose pedigree for an inherited disorder is depicted in the figure below consult with you about the probability that their progeny may be afflicted. a. What advice would you give individual III -1? No chance the children will have his trait b. What advice would you give individual III-2? Likely all children will have the trait c. What advice would you give individual III-4? No children will have the trait d. What advice would you give individual III-6? Children will likely all have the trait e. What advice would you give individual III-8? No chance the children will have the trait Unaffected female, Affected male or unaff male = no chance children have trait Affected female = children have the trait 3. If the mother and grandmother of a given family both exhibit phenotypic effects of a mitochondrial

disorder, how is it possible that the mother's three children each have different phenotypes from one another and different degrees of severity? Variable penetrance 4. Contrast the mechanism that gives rise to tortoise-shell cats (a mosaic coat color) with the mechanism that gives rise to variegated plants.? Cats  X inactivation Variegated plants  heteroplasmy inheritance 5. The first person in a family to exhibit Leber hereditary optic neuropathy (LHON) was II-3 in the pedigree shown below, and all of her children also exhibited the disease. Choose explanations as to why II-3's mother I-1 did not exhibit symptoms of LHON. Incomplete penetrance Effects of genetic interactions with nuclear genes Environmental factors with mitochondrial gene mutations

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