In the late 1920s, a mutation occurred in many silver fox farms around the world. The fox farms that
sold expensive furs were proud of the quality of their furs, and each advertised that it had the best and
most pure breed of all the fox farms. The new mutations produced a "platinum" coat pattern that was
commercially desirable, so the farms crossed them to get more. The results of their breeding
experiments were as follows: (1) silver ? silver ? all silver offspring; (2) silver ? platinum ? equal
numbers of silver and platinum; (3) platinum ? platinum ? 2 platinum for each silver offspring.
Explain. What will be an ideal response?
PP (silver), Pp (platinum), pp (lethal)
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Erwin and Scott used an insecticidal fog to knock down insects from the top of a L. seemannii tree
The researchers identified over 900 species of beetles among the individuals that fell. Erwin also projected that this entire tree is host to about 600 arthropod species unique to this tree species. There are approximately 50,000 species of tropical trees. Although it could not be entirely accurate, what would be the best way to estimate the total number of arthropod species? A) Estimate the species density and then multiply by 50,000. B) Multiply 900 by 50,000. C) Multiply 600 by 50,000. D) Divide 900 by 600 and then multiply by 50,000.
When under attack, ciliates can eject dart-like protein threads from surface organelles called
a. vacuoles. b. gullets. c. trichocysts. d. phagosomes. e. alveoli.
Global air circulation patterns are produced by ____ differences in the amount of solar radiation reaching Earth
a. elevational b. latitudinal c. moisture d. rotational e. longitudinal
African sleeping sickness is caused by Trypanosoma brucei, a unicellular, flagellated protist that infects red blood cells after entering the bloodstream. Trypanosoma brucei is which of the following?
A. an alga B. a protozoan C. a slime mold D. a diatom E. a water mold