Restorer and mitochondrial mutation

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Cytoplasmic male sterility is caused by an interaction between a nuclear locus, Restorer, and a mitochondrial mutation. Female fertility is not affected by the mitochondrial or nuclear genotype, however male fertility is affected according to the chart below. Mitochondrial genotype Þ mtN (Normal) mtS (Sterile) Nuclear Genotype ß RR mtN RR (males fertile) mtS RR (males fertile) Rr mtN Rr (males fertile) mtS Rr (males fertile) rr mtN rr (males fertile) mtS rr (males sterile) a. You are a plant breeder working on a new variety of maize. You pollenate a plant with an unknown mitochondrial and nuclear genotype with pollen with an mtN Rr genotype. Half the progeny have male sterility, half have normal male fertility. What is the seed plant's mitochondrial and nuclear genotype? b. Draw this cross and progeny as a pedigree, labelling each individual with the nuclear and mitochondrial genotype. Indicate which individuals will be male-sterile. c. You take pollen from one of the male-fertile plants, and pollenate a plant with an unknown mitochondrial and nuclear genotype. All the progeny are male fertile. What are the possible genotypes of the seed plant? State any assumptions you make.

Reference no: EM133814878

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