The trait for color dominates albino, and black fur dominates red fur. If an animal homozygous for color and heterozygous for black fur is crossed with an albino homozygous for red, the ratio of offspring would be
A. 1/2 red, 1/2 black.
B. all albino.
C. all red.
D. 1/2 albino, 1/4 black, 1/4 red.
A. 1/2 red, 1/2 black.
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The abundance of cyanobacterial mats has greatly declined due to the evolution of
A) antimicrobial-producing fungi. B) bacteriophages. C) metazoan grazers. D) Proteobacteria.
TCA cycle enzymes are found in the ________ of eukaryotic cells.
Fill in the blank(s) with the appropriate word(s).
The boreal forests of North America are dominated
by a. spruce, fir, and pine. b. redwoods and sequoia. c. birch and aspen. d. long-leaf and loblolly pines. e. cedars and junipers.
Which one of the following segments of the typical cardiac cycle is the briefest?
A) atrial systole B) atrial diastole C) ventricular systole D) ventricular diastole E) macular systole