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Female Drosophila heterozygous for three recessive mutations e (ebony body), st (scarlet eyes), and ss (spineless bristles) were testcrossed, and the following progeny were obtained: Phenotype Number wild-type 67 ebony 8 ebony, scarlet 68 ebony, spineless 347 ebony, scarlet, spineless 78 scarlet 368 scarlet, spineless 10 spineless 54 (a) What indicates that the genes are linked? (b) What was the genotype of the original heterozygous females? (c) What is the order of the genes? (d) What is the map distance between e and st? (e) Between e and ss? (f) What is the coefficient of coincidence? (g) Diagram the crosses in this experiment.
Compared with the normal region of DNA, what unique characteristic does the DNA replication origin have?
As a cell grows, what happens to its surface area : volume ratio? (Think of a balloon being blown up). How is this changing ratio related to cell division.
How is MPF involved in one or more of checkpoints. A chemist wishes to create an organic molecule non-acidic.
The purity of cytochrome c can be evaluated by the ratio of the molar extinction coefficient (129.1 mM-1cm-1) at 416 nm of the reduced cytochrome c and the molar extinction coefficient (23.2 mM-1cm-1) at 280 of the oxidized cytochrome c.
Compute the observed distance d at the molecular level between the three sequences and the corrected distance by using kimuras 2 parameter k2 method
About 13 different species of finches inhabit the Galápagos Islands today, all descendants of a common ancestor from the South American mainland that arrived a few million years ago.
You put a cuvette into a spectrophotometer and obtain an absorbance reading of 2.4. How much light is actually reaching the detector?
Why are grasses (rather than, fro example, daisies or carrots) often planted for erosion control?
if, in the same cell, the Golgi membrane is 8 times the area of the plasma membrane, what is the ratio of Golgi membrane proteins to other proteins in the ER?
If the VE of a trait decreases, what happens to the narrow-sense heritability? Explain your answer in terms of the equation VP = VA + VD + VI + VE + VGE
A couple, George and Lara, have three sons. The oldest and youngest are normal but the middle child has xeroderma pigmentosum.
The hypothetical OxyA protein is a surface protein that may have a role in attachment to the surface of the intestinal epithelium but there is evidence that it has a role in invasion. Write the structural formula for isoamyl alcohol.
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