Cliff has colorblindness and icthyosis, which causes scaly skin. Both traits are X-linked recessive. The probability that he transmits both traits to his sons is
A) 0
B) 1/4
C) 1/2
D) 3/4
A) 0
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Drug-resistant strains of Streptococcus pneumoniae are now treated with ________.
A. tetracyline B. vancomycin C. penicillin V D. Ketek E. eryrthromycin
What are the two main determinants of the type of biome that will form in a given region?
a. Rainfall and daylength b. Soil pH and rainfall c. Soil pH and temperature d. Temperature and rainfall e. Amount of sunlight and topography
Manatees feed mostly on:
a. small fishes. b. benthic invertebrates. c. plankton. d. aquatic plants. e. other marine mammals.
Place the following hypothesized events of the
beginning of life in their correct order I organic polymers form II inorganic molecules form III DNA-based cells form IV organic monomers form V protocells in the RNA world form
a. I, III, V, IV, II d. IV, I, II, III, V b. II, I, IV, V, III e. II, I, IV, V, III c. II, IV, I, V, III