Introduction to Genetic Analysis 114

Introduction to Genetic Analysis 114 - 44200_03_p73-114...

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A 1 2 3 4 5 6 7 8 9 10 11 12 B a b A A b b A A B B a a B B A A b b a a B B a A A a a A B b b B B b A a b B A A a a a a b b b b B B A A B B a A A a b B b B a a a a B B B B B A A B a b a b A A A A a a B B b b B B a a b b a A B b A a b B 42. One form of male sterility in corn is maternally transmitted. Plants of a male-sterile line crossed with normal pollen give male-sterile plants. In addi- tion, some lines of corn are known to carry a domi- nant nuclear restorer gene ( Rf ) that restores pollen fertility in male-sterile lines. a. Research shows that the introduction of restorer genes into male-sterile lines does not alter or affect the maintenance of the cytoplasmic factors for male sterility. What kind of research results would lead to such a conclusion? b. A male-sterile plant is crossed with pollen from a plant homozygous for gene Rf . What is the genotype of the F 1 ? The phenotype? c. The F 1 plants from part b are used as females in a testcross with pollen from a normal plant ( rf
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This note was uploaded on 01/10/2011 for the course BIOL BIOL taught by Professor Johnson during the Spring '08 term at Aberystwyth University.

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