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Q1. A farmer decides to plant 90 percent of one field with BT 123 seeds and the remaining 10 percent of the field with a different seed variety. He hopes this will slow the evolutionary development of BT resistant insects. Which seed variety must he use the 10 percent of his field that is not planted with BT 123 seeds? Explain the answer.
Q2. An experiment was completed to determine the linkage relationship of three genes (a, b, and c) in Drosophila melanogaster.
Homozygous females phenotypically a, c were crossed with homozygous males phenotypically b. The F1 females were all wild-type in appearance and the F1 males were all a, c.
Provide the genotypes of the parents? Give genotypes of the F1 flies and demonstrate the genotypic arrangement in the female F1?
What process is responsible for position effect variegation? A. Inactivation of a gene due to deletion B. Activation of a gene by an enhancer C. Gene duplication D. Inactivation of a gene due to its incorporation in a heterochromatic region of the..
Assume that you measure the OD of an overnight E.coli culture. The spectrophotometer gives you a reading of 2.8. What would you do to determine the concentration of your overnight culture and why? Give a detailed explanation!
Which of these would decrease transpirational pull: thicker film of water on surface of mesophyll cells, higher relative humidity in air around leaf, lower rate of water evaporation from surface of mesophyll cells, larger diameter of stomatal pore..
In an experimental situation, a student researcher inserts an mRNA molecule into the cytoplasm of a eukaryotic cell after she has removed its 5' cap and poly-A tail.
In addition to the main bacterial chromosomes, most bacteria also carry additional mini-chromosomes (plasmids), which carry nonessential genes or provide special functions.
Niremberg used the enzyme polynuclotide phosphorylase to assemble RNA with random sequences in the absence of a template. Suppose they added the enzyme to a solution of 90% GTP and 10% UTP, and then used the cell-free system of protein synthesis t..
You have determined the DNA- binding site of a protein by determining the DNA footprinting after labeling one strand. To check your results, you repeat the experiment after labeling the other strand of the duplex.
A 70-year old woman presents with a one hour history of crushing substernal chest pain. Shortly after admission, the patient expires.
Prolonged exposure to cigarette smoke causes damage to ciliated epithelium that lines portions of the respiratory tract. Discuss the implications of the damage.
If you had a mutation affecting anterior-posterior patterning of the Drosophila embryo in which every other segment of the developing mutant larva was missing, would you consider it a mutation in a gap gene, a pair-rule gene, a segment-polarity ge..
Analyze the contributions of select scientists from the Greek and Roman period. Explain the Arab influence on the development of anatomy and physiology.
In allosteric deactivation a regulatory molecule binds to a site other than the active site, resulting in a change in enzyme shape that allows the active site to bind substrate.
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