The blastocoel is:
A) a fluid-filled cavity. B) the group of cells that form the archenteron.
C) a fertilized egg. D) a hollow sphere of cells.
Answer: A
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A gene for sweat gland production is found on the X chromosome. If a man who lacks sweat glands marries a woman who has normal sweat glands, what will be the phenotype of their children?
A. All of the boys will lack sweat glands. B. All of the girls will lack sweat glands. C. The girls will have sweat glands in some areas, but lack sweat glands in others. D. All of the boys will have sweat glands. E. All the boys will have sweat glands, and the girls will have sweat glands in some areas but not others.
Pouches in the gut wall developed into ____ in
fishes that are ancestral to land vertebrates. a. heart chambers b. the notochord c. lobes of the liver d. lungs e. vocal cords
Four of the following explain the area effect on island diversity. Which one is the exception?
A. Larger islands have more habitats. B. Smaller islands have more varied and higher elevations. C. Larger islands intercept more colonizers. D. Smaller islands have less complex topography. E. Smaller islands have a greater probability of a species becoming extinct.
In sweet peas, dominant alleles C and P are necessary for colored flowers. In the absence of either (__ pp or cc __) or both (cc pp), the flowers are white. What the phenotypic ratios be for the cross of Cc pp x cc Pp?
A. 1/4 color, 3/4 white B. 9/16 color, 7/16 white C. 3/4 color, 1/4 white D. 1/4 color, 3/4 white E. 1/2 color, 1/2 white