If quadruple heterozygote of genotype Aa Bb Cc Dd is self-fertilized, what is the probability of a quadruple heterozygote Aa Bb Cc Dd offspring is assuming independent assortment of all four pairs of alleles.

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#Question id: 15658

#SCPH06 I Botany

You are studying a new strain of E. coli that can utilize the disaccharide melibiose very efficiently. You find that utilization depends on the enzyme melibiase, which is encoded by the gene Mel1. Mel1 is not expressed unless melibiose is present in the growth medium.

Next, you isolate a third mutant, MelC–, which gives constitutive melibiase expression. The MelC– mutation is closely linked to Mel1 and MelB–. Genetic tests of the MelC– mutation yield the following:

 

As above, classify the MelC– mutation in terms of its basic genetic properties and explain how you arrived at your conclusions.

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#Question id: 15661

#SCPH12 I Genetics

Which of the following is NOT true of a maternal effect gene?

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#Question id: 15666

#SCPH12 I Genetics

Which of the following could NOT be used to describe a sex limited trait:

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#Question id: 15668

#SCPH12 I Genetics

How is genetic transfer different from sexual reproduction?

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#Question id: 15669

#SCPH12 I Genetics

 Which of the following is a description of generalized transduction?

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#Question id: 15670

#SCPH12 I Genetics

A researcher would like to map the location of galE and trpA genes in a new species of bacterium that appears to be closely related to E. coli. He decides to use cotransduction, and generates appropriate donor and recipient strains. He is disappointed when cotransduction is not seen in his experiement. What is the most reasonable explanation for this situation?