In Drosophila melanogaster, vestigial wings are caused by a recessive allele of a gene that is linked to a gene with a recessive allele that causes black body color
Morgan crossed black-bodied, normal-winged females and gray-bodied, vestigial-winged males. The F1 were all gray bodied, normal winged. The F1 females were crossed to homozygous recessive males to produce testcross progeny. Morgan calculated the map distance to be 17 map units. Which of the following is correct about the testcross progeny? A) black-bodied, normal-winged flies = 17% of the total
B) black-bodied, normal-winged flies PLUS gray-bodied, vestigial-winged flies = 17% of the total
C) gray-bodied, normal-winged flies PLUS black-bodied, vestigial-winged flies = 17% of the total
D) black-bodied, vestigial-winged flies = 17% of the total
C
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By controlling the concentration of nutrients added into a chemostat continuously, cells can constantly be maintained at
A) exponential growth phase. B) stationary growth phase. C) log or stationary growth phase. D) death growth phase.
An example of a member of the class Anthozoa of the phylum Cnidaria is:
a. Portuguese man-o-war. b. jellyfish. c. sea anemone. d. sea wasp. e. hydroid.
Forests and other natural ecosystems, such as wetlands, exhibit the "sponge effect," meaning that they
A) soak up water from runoff and rainfall, and thus accumulate pollutants B) soak up pollutants from runoff and rainfall, releasing it quickly into streams and rivers and raising their levels C) soak up water from runoff and rainfall, saturating nearby ecosystems D) soak up water from runoff and rainfall, releasing it at a regular rate that moderates flooding of streams and rivers E) draw water away from rivers and streams, lowering their levels
Rosalind Franklin created the first ____.
A. clear x-ray diffraction image of DNA as it occurs in cells B. model of DNA’s nucleotide bases C. experiment to test whether base-pairs differ among species D. hypothesis surrounding the nature of a hereditary molecule E. results proving that bases exist on the outside of a helix