Assuming independent assortment, what phenotypic ratio would you expect to see if an individual with the genotype RrGg is self-crossed?
A) 1:3
B) 9:3:3:1
C) 1:2:1
D) 1:3:2:1
E) 3:1
B
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Under the conditions known as El Niño, the inorganic nutrient content of the seawater off the coast of Peru declines to very low levels. What effect will this likely have on marine life in the area?
A) The lower the levels of minerals, the less polluted the water; hence, most populations will increase. B) It will result in toxic red tides, which will reduce the populations of many species. C) It will reduce the abundance of phytoplankton and, consequently, the abundance of other organisms. D) It will increase the productivity of phytoplankton and, therefore, the productivity of other organisms by allowing sunlight to penetrate deeper into the ocean.
The biggest problem facing coastal habitats is not dumping but:
a. overfishing. b. river runoff. c. development. d. offshore oil spills. e. nuclear power plant leakage.
According to the fossil record, the oldest vascular plants are placed in which phylum?
a. Rhyniophyta b. Bryophyta c. Anthocerophyta d. Pteridophyta e. Lycopodiphyta
Explain at least four ways that primates are adapted to an arboreal existence. Indicate whether the statement is true or false