What is a possible explanation for why a population may not be in Hardy-Weinberg equilibrium?
A. There are more than two alleles for a trait.
B. One allele for a trait is fixed in the
population.
C. Evolution is occurring on a trait in the
population.
D. Hardy-Weinberg does not work for all
traits.
E. The alleles for a trait being examined
exhibit incomplete dominance.
C
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Short tandem repeats (STRs)
A. are useful in identifying specific individuals. B. are important sites in vectors where foreign DNA can be integrated. C. are errors that can arise during DNA sequencing. D. are DNA fragments generated during PCR.
A ____ feedback control system functions when a change in the internal environment triggers the body to oppose the
change and restore the normal environmental conditions.
a. positive b. physiological c. reflex d. negative e. anatomical
Which of the following is not a characteristic of annelids?
A. They are segmented. B. They have bilateral symmetry. C. They have an incomplete digestive tract. D. They have a coelom. E. They have organ systems.
An example of commensalism is a(n) ____
a. a clown fish living in a sea anemone b. an orchid growing on a tree branch c. yucca plant seeds dispersed by yucca moths d. Canadian lynx preying on a snowshoe hare e. a tapeworm living in a human intestine