quiz 8 key - Biochemical studies revealed that some of...

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Name_____________________________  BIOLOGY 325H QUIZ 8  [5 pts] _____________________________________________________________ 1.  [2 pts]  A geneticist crosses a male fruitfly that is homozygous for a null allele of the  bicoid  gene ( bcd - /bcd - ) with a  female that is heterozygous wild-type ( bcd + /bcd - ). What fraction of their offspring will show the   bicoid  mutant phenotype and what fraction will be wild-type? All offspring will show the wild-type phenotype, since their mother carried a copy of the wild-type  bcd allele. 2.  [1.5 pts] Driever and Nüsslein-Volhard identified multiple binding sites for the Bicoid protein in the genomic DNA  located upstream of the transcription start site of the gene  hunchback. 
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Unformatted text preview: Biochemical studies revealed that some of these sites bind the Bicoid protein with high affinity, whereas other sites bind Bicoid with low affinity. What is different about these binding sites that accounts for their differing affinity to this protein? Each binding site is a stretch of double-stranded DNA 8-10 nucleotides in length. Different binding sites vary in their affinity for Bicoid protein because they vary in their nucleotide sequence. 3. [1.5 pt] What must be true about the structure of two nucleic acid strands in order for them to hybridize with one another? A complementary sequence of nucleotides. Name_____________________________...
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This note was uploaded on 05/14/2008 for the course BIO 325H taught by Professor Staff during the Spring '08 term at University of Texas.

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quiz 8 key - Biochemical studies revealed that some of...

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