Balanced polymorphism can be maintained by the combined actions of:
a. the founder effect and genetic drift.
b. heterozygote advantage and genetic drift.
c. heterozygote advantage and the founder effect.
d. frequency-dependent selection and the founder effect.
e. heterozygote advantage and frequency-dependent selection
e
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Which observations illustrate shared ancestry by anatomical comparison studies? Check all that apply.
_____ The same structure has evolved to carry out different functions. _____ Different structures evolve in similar ways when subjected to the same selective pressures. _____ A structure becomes vestigial. _____ Structures are found to be homologous.
Impulses from a sense organ may differ in all of the following ways except in:
a. the total number of fibers transmitting messages. b. the frequency of the action potentials passing over a given fiber. c. the total number of action potentials passing over a given fiber. d. the specific types of action potential. e. the specific fibers carrying action potentials.
The opening in the eye through which light passes is known as the ____
a. sclera b. pupil c. iris d. lens e. cornea
Planting the same crop in straight rows prevents soil erosion.
Answer the following statement true (T) or false (F)