Mouse pigmentation is subject to epistasis of the B alleles by the d alleles. B (black) is dominant over b (brown), and
D is dominant over d. Homozygous d is epistatic to the black and brown genes. Given this information, what genotype(s)
result in a white mouse (no pigment)?
a. BBdd only
b. Bbdd only
c. bbDD only
d. bbDd only
e. BBdd and Bbdd
ANSWER: e
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In the Calvin cycle, carbon dioxide molecules are reduced by the addition of electrons carried from the light reactions by
A. NADP+. B. oxygen. C. NADPH. D. ATP. E. water.
In the process of peristalsis:a
waves of muscular contractions force food down the digestive tract. b. chemical digestion of food takes place in the digestive tract. c. food is discharged from the bodies of unicellular animals. d. digestion occurs intracellularly within food vacuoles. e. digestion of food takes place outside the body of an animal.
The phenotypic ratio resulting from a dihybrid cross of two heterozygote individuals showing independent assortment is expected to be
A) 1:2:1 B) 3:1 C) 9:1:1:3 D) 9:3:3:1
Lenski and Travisano compared what happened to the size of cells in 12 replicate lines of E. coli. The results of the experiment graphed in the figure above indicate that:
a. there is a competition for limited resources in nature. b. the average cell volume decreased substantially over the first 2,000 to 3,000 generations of the experiment. c. the average cell volume increased substantially over the first 2,000 to 3,000 generations of the experiment. d. A and B. e. A and C.