The distinctive fur pattern of Siamese cats results when genes that are responsible for the coat color are influenced by
A) age.
B) X-inactivation.
C) gender.
D) temperature.
E) other genes.
D
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In humans, heritability of clubfoot is 0.8. This means that expression of this condition is
A) strongly influenced by environmental factors. B) solely dependent on inheritance of the clubfoot gene(s). C) strongly dependent on inheritance of the clubfoot gene(s) but also influenced by environmental factors. D) inherited from an affected parent 80% of the time.
The dominant autotrophs of the open water are
A) phytoplankton. B) kelp. C) seagrasses. D) stromatolites.
The observation that although fresh water habitats account for only 1% of the Earth's water, they are home to 36% of the known species of fish is due to _______ speciation.
A. prezygotic B. postzygotic C. allopatric D. sympatric E. outgroup
If organs are analogous to the body, which of the following are organelles analogous to?
a. an eukaryote b. a prokaryote c. a cell d. an animal