Using Mendel's flower color (purple is dominant, white is recessive), if two heterozygous plants are crossed, what is the probability that the first two offspring will have purple flowers?
A. 1/2
B. 1/4
C. 6/4
D. 9/16
E. 1/16
D
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The process by which water can be added to or removed from the plasma is ____
a. vasodilation b. cardiac output c. elastic recoil d. bulk flow e. active transport
Which listing of geological periods is in the correct order, from oldest to most recent?
A) Cambrian, Devonian, Permian, Cretaceous B) Devonian, Cambrian, Permian, Cretaceous C) Cambrian, Permian, Devonian, Cretaceous D) Permian, Cambrian, Cretaceous, Devonian
Which of the following best describes the mechanism behind the change in beak size in the finch population?
a. The formation of two new finch species from a single parent species b. A change in gene frequencies in the finch population due to the selective pressure from environmental change c. A new allele appearing in the finch population as a result of a mutation d. The achievement of dynamic equilibrium in the finch population as a result of homeostasis
The following are all functions of a typical plasma membrane except:
A. expression of cellular identity B. selective transport of certain molecules and material C. reception of information D. transport of water and bulk material E. Be permanent in composition