In horses, there are four alleles at the A locus. Arranged in dominance sequence they are:A
(wild), ab (bay), ac (brown), ad (black)
If you bred several bay mares whose sires were brown to a brown stallion whose sire was black, what are the genotypes of
the parents; what type of offspring would be produced; and in what proportion? What will be an ideal response?
ANSWER: abac x acad; 1/2 bay, 1/2 brown
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Quality control is set up to test urea agar. M. genitalium and M. hominis are used; however, both organisms are negative for urease activity. Which one of the following statements explains these findings?
a. The urea agar is most likely expired. b. The incubation time is most likely abbre-viated. c. A technical error has occurred. d. These two organisms are poor choices for quality control of urea agar.
Which of the following statements regarding erhlichiosis is incorrect?
A. The disease vector is transmitted by Ixodes ticks. B. Symptoms include fever, headache, and muscle pains. C. Treatment requires an extensive course of antibiotics, usually 3-6 weeks. D. It often coinfects with Borrelia burgdorferi. E. The disease is diagnosed by PCR or indirect fluorescent antibody tests.
In prokaryotes, the term prokaryotic fission specifically refers to
A) the addition of a new plasma membrane between what will become two daughter cells. B) the growth phase of the cell cycle. C) asexual reproduction. D) the attachment of replicated DNA to the plasma membrane.
Sometimes, the decline of one species threatens the survival of another species. Which scenario is an example of this?
A. Declines in polar bears result in diminished prey populations B. The arrival of sailors on Mauritius island led to the extinction of dodo birds C. Declines in eagle populations due to the accumulation of pollutants in their eggs D. Decline in buffalo caused a drop in native buffalo clover E. Pollution led to declines in the Texas blink salamander population