About 80% of the alleles present in thoroughbred horses can be dated back to 31 known ancestors from the late eighteenth century. As a result, one would expect ________
A. low rates of mutation.
B. many polymorphic alleles.
C. Hardy-Weinberg equilibrium.
D. little variation in physiology and behavior.
E. random mating.
Answer: D
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Members of the ____ ("jointed feet") Ecdysozoan phylum have a segmented body encased in a rigid exoskeleton made
of chitin plus other materials.
a. Arthropoda b. Onychophora c. Nemertea d. Annelida e. Nematoda
Veins from the ____ join together and form the hepatic portal vein
a. large intestine b. liver c. pancreas d. small intestine e. stomach
Four of the five choices listed below are
characteristics of xylem. Select the exception. a. is dead at maturity b. cell walls are impregnated with lignin c. conducts dissolved food d. includes tracheids and vessels e. has pits in the walls of the cells
Which of the following approaches is likely most successful to prevent soil erosion?
(a) Farming using contour tillage (b) Fungal phytoremediation (c) Drip irrigation (d) Condensing the soil with heavy machinery