What term is used to describe the situation when the loss of an allele because of selection against one of its phenotypes is balanced by natural selection in favor of the allele for another phenotype?
A) equilibrium frequency
B) heterozygote fitness
C) restriction fragment length polymorphism
D) single nucleotide polymorphism
E) balanced polymorphism
E
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Birds have
A. a backcurrent lung. B. an air sac lung. C. a parabronchial lung. D. a negative pressure lung. E. a tracheal lung.
In the diagram, which of the following is true?
A. Both diagrams show developmental sequences occurring in the same animal.
B. Both diagrams show blastulae.
C. Diagram II shows gastrulation in a bird.
D. Diagram I shows gastrulation in a frog.
E. Diagram I shows gastrulation in a mammal and diagram II shows gastrulation in a reptile.
During exercise, O2 is depleted in muscle tissue. What effect would this have on internal respiration?
A) There would be increased diffusion of O2 out of the blood and into the muscle tissue. B) There would be decreased diffusion of O2 out of the blood and into the muscle tissue. C) There would be increased diffusion of O2 out of the blood and into the lungs. D) There would be decreased diffusion of O2 out of the blood and into the muscle tissue and a decrease in heart rate to bring more O2 to the exercising muscle.
Lining of blood vessels and alveoli of lungs
What will be an ideal response?