In Drosophila, the genes y (yellow body) and car (carnation eyes) are located at opposite ends of the X chromosome. In doubly heterozygous females (y+car+ / ycar), a single chiasma is observed somewhere along the X chromosome in 90% of the examined oocytes. No X chromosomes with multiple chiasmata are observed. What percentage of the male progeny from such a female would be recombinant for y and car?
A) 5%
B) 10%
C) 45%
D) 55%
E) 90%
C) 45%
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The oldest plant community in Glacier Bay is hemlock-spruce forest. You would predict that hemlock and spruce trees are _____-selected species
A. r B. K
Goiter is a disease characterized by an enlarged thyroid gland. Which of the following either leads to or is an outcome of the disease?
A. iodine deficiency in the diet B. reduced levels of T3 in the blood C. reduced levels of T4 in the blood D. excessive thyroid-stimulating hormone production E. All of the choices are correct.
A cell contains 30% solute, while the external environment contains 10% solute. What kind of solution is this cell sitting in?
a. hypotonic b. isotonic c. hypertonic d. osmotonic
During the Krebs cycle, acetyl CoA covalently binds to oxaloacetate to form citrate, a ________ -carbon molecule
A) five B) three C) six D) four E) two