Gene therapy:
A) involves introducing non-defective genes into the cells of an individual with a genetic disorder.
B) relies on drug treatment of patients with genetic disorders at specific times that correspond with cell division.
C) involves no controversial or ethical questions.
D) is defined as the replacement of organs from patients with genetic disorders by transplant.
E) has been wildly successful in curing human diseases.
A) involves introducing non-defective genes into the cells of an individual with a genetic disorder.
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Which of the following statements about the fast block to polyspermy is FALSE?
a. It occurs within seconds after fertilization. b. It involves a wave of electrical depolarization that spreads over the egg surface. c. It is not mediated by Ca2+ ions. d. It is more pronounced in vertebrates than in invertebrates. e. It is more pronounced in invertebrates than in vertebrates.
What is the term for selection that favors altruism toward relatives?
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An example of a non-specific chemical barrier to infection is
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