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In a cross in Drosophila, a female heterozygous for the autosomally linked genes a, b, c, d, and e (abcde/+++++) was testcrossed with a male homozygous for all recessive alleles. Even though the distance between each of the loci was at least 3 map units, only four phenotypes were recovered, yielding the following data:
Phenotype Frequency
+++++ 440
abcde 460
++++e 48
abcd+ 52
Why are many expected crossover phenotypes missing? Can any of these be mapped from the data given here? If so, determine the map distances.
Assume i f you are performing in-situ hybridization to detect mRNA, why do you use the antisense strand? Are you using RNA or DNA as a probe for mRNA?
Explain why would temperature affect respiration rates and what is going on at the cellular level that could be impacted by either an increase or a decrease in the temperature in which an organism is found?
Palmitate uniformly labeled with the radioisotope 3H to a specific activity of 2.5 x 108 cpm per micromole of palmitate is added to mitochondria, which oxidize it to acetyl-CoA.
The sequence of the cloned DNA and the amino acids encoded by open reading frames. Stop codons are underlined and labelled 2 or 3 to indicate their reading frame.
Describe what are the three different microbial groups in anaerobic digester, and how they work together to convert complex polymers to methane gas.
A twenty-oneyear-old woman presents with a three month history of malaise, joint pain, weight loss, and sporadic fever. Her temperature is 38°C (101°F).
List and depict at least three prokaryotic cellular features that could be targeted in this way to inhibit or kill a bacterial pathogen.
Their water vascular system with tube feet is unique. Sea lilies (Crinoids) might be closest to the ancestral echinoderm. Other groups are modified from this. Chordates -An interesting sidelight: Which side is up.
Glycogen synthase catalyzes glycogen synthesis. determine whether each of the following are associated with an increase or decrease in glycogen synthase activity.
What are the steps in isolating the DNA from strawberries. What are the materials required to isolate DNA.
A karyotype reveals that an individual is XYY
non covalent interactions which are most important. What is the driving force for proteins that are embedded in lipid membranes?
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